Glad I did it, but more difficult than expected
585584
Pump was very high quality and matched the size of the original FoMoCo pump perfectly.  Without a doubt I am pleased with the product AND happy I replaced the oil pump.  Now a few things to consider:
1. Watch the Fordtechmakuloco video on youtube.  He makes it look very straight forward.
2. I did not find it as straight forward as he did.  In particular the fitment of the pump all the way on the crank was very difficult to achieve, especially hanging upside down from the top of the radiator.
3. Melling has a special procedure for priming the pump that includes equipment not sold here.  This was not followed in the video I watched nor was it in any provided direction (none at all provided).
4. My pump WOULD NOT PRIME with simply cranking the engine with the crank sensor disconnected.  Prime was eventually achieved but after about 20 15 second cranks (battery charge after about 10).  Also pumped oil into pressure sensor port.  I did pre-oil pump, but perhaps packing with assembly lube might have been better.  Again - no directions.  How much damage occurred in that time?
5. Engine runs fine now, including building pressure at start up.
1253131
I'm actually pretty good at putting together furniture from places like IKEA, where the instructions are vague and incomprehensible, so I thought I'd be completely prepared to put this shoe rack together. After all, shoe racks are pretty simple. However, it gave me a huge amount of difficult. None of the slots fit together. I know I did it right, but I think my product might have been a bit of a dud? It was dirty, and the instructions had stains on them like they'd been opened before. I measured it and the slots didn't quite align, so I'm very confident it's not me.
Either way, I gave up after about twenty minutes and said "Good enough". It doesn't fit quite perfectly, but it works as it is. Other than that, it's nice enough. Fits well in my dorm. You can't tell from the pictures, but close up, the material is a sort of dark fake-wood stain.
4271260
Great kit, but keep in mind that all of the small details make it rather challenging
3659538
I've been learning German for about a year now, all through self-study and Livemocha.com. I found this book to be very challenging, for the same reason another review stated: Many sentences that are either examples or parts of the drills use vocab or syntax that have not yet been explained. I actually had to keep a German dictionary by my side while working through this, which made the process three times as slow. It was either that, or resign myself to not understanding about 1/4 of what I was writing.

Another reviewer stated there's no clutter and the font is nice...it's true, however I also found it a little dry. I'm a very visual person, the kind that color codes my notes, so the absence of ANY kind of decor within the book made it seem monotone and inaccessible at times.

That being said, my ability to read German has improved greatly since I first began, so it achieves its primary function. Learning a language requires so much dedication, determination, and PATIENCE, all of which are required to complete this particular book. Think of it as a labor of love.
3725861
Deceptively difficult!!! You need to rely almost completely on the shape of the puzzle pieces without clues from the color/design of the picture. Fun and frustrating -- and a sense of accomplishment when completed. Beautiful image, solid pieces, good quality.
4248035
It's not nearly as hard as some of the others make it seem--they likely just lack experience. It was my 5th model ever, and I finish in 10.5 hours (although I apparently have the natural dexterity for micro-assembly). Not so much difficult as tedious: you have to fit a dozen tabs at once, so the bend angles are critical; it can become quite vexing at times. Definitely NOT for beginners, novice, or amateurs. On a generic/average scale, I would rate it hard to expert level. Also, exercise caution when taking parts out of sheet (as always) because there are small parts that'll break, like ships. I did not have this problem, but I can see it happening. Overall, it's a fun, majestic, and milestone piece that'll leave you feeling weary but accomplished since it's one of the most intricate and sophisticated buildings models.
3261216
A new user to FormZ I was stuggling to find a way to alleviate the stress of such a high learning curve. This book helps in more of an indirect way then I had expected. The tutorials are relativly well written but are  difficult to reproduce. I found myself banging my head against the wall  trying to figure out what I had done wrong. When I did figure it out I did  learn but only after hours of frustration. If you are a new user be  prepared for some long hours.
626303
Its tough. Not sure I love it though...but it is definitely challenging.
1794432
This was extremely difficult to put together.  I wanted to have it ready when my husband came home as a surprise.  After three hours I realized I couldn't do it on my own.  The issue is you have to "muscle" the last two screws in while stretching the fabric.  I walked down to the neighbors (1/4 miles away) and between the three of us, we were able to get it done.  It looks like it's going to work well, and I hope it does.  I can tell you the fabric is never getting changed.  An average man could probably put it together, but not me.
484088
Difficult instructions once I understood easy to use
3275852
It was a little harder to install than I thought, but it works.
2143110
It's so hard to get started! I love the challenge though! I had to put it away for awhile to regroup!
1079313
Very challenging to do, but the end result is amazing.
1254526
As an experienced handyman I don't usually sweat putting together products I purchase.  This installation however took patience.  Aligning a total of 24 bolts through three layers was the most difficult part.  The consistency of the hole location was off.  This usually isn't a problem, however the bolt must fully fit, or the square head will not "catch" and the bolts will just spin when you tighten them.  I also received two bolts that were slightly bent.

Note: after installing, watch a YouTube video of how to properly strap a J rack.  I assumed I had it attached adequately, however a kayak started to blow off the roof and had to pullover.
2620144
I set to work installing this hitch on my 2012 civic after going through the video several times. There is also an instruction sheet in the package that cleared several points of doubt in my mind, ie, which screw or bold will go where, and it helped me greatly. The hardest part for me was working with the car's exhaust. Getting it off was relatively easy, but the rubber that held the exhaust's prongs was very tight and it needed quite a bit of muscle power to pry them off (I used the WD40 lubricant too)
What was not clear to me from the video or the instructions, is what is meant by "lifting the hitch and the exhaust simultaneously". I found this out the harder way, when I finished tightening the hitch (I had to take great care not to get my hand slip into the jagged heat shield, which would have been a bloody affair with grease thrown in). Gloves would have helped, as did my eye protection, when a bolt fell down on it (yes, I was lying down below the car as I didn't have a way to elevate it)
So after tightening the hitch with all my might as said above, I find that the piece of rubber that held the exhaust is caught between the hitch and the muffler and it was also quite inaccessible. I gave up and continued the work only next day. The rework involved loosening the hitch again, then use screw-driver and fingers (all the fingertip pushups I had done in my life must have helped) to yank the rubber over the prongs and push them through, but it was done at last, and I tightened the hitch screws for the second time taking care of that dreaded heat shield jagged edge
3143605
The end result is fantastic but it was not easy to put up. We ended up removing the backing in rows which was easier than trying to remove it as a whole, which is how we initally started. I also ended up with a blister on my finger tip from rubbing each individual letter into the wall while removing the backing.
4823623
More challenging than I thought it would be, but fun for a group.