I can definitely sympathize about rebuilding your car! even on a 4cyl, pulling a tranny is HEAVY!!!!!

I know what you're going through. I call it a "paralitic pre-emptive fear of failure". You just have to psych yourself up, tell yourself you're going to do it the best you can, and GO FOR IT! If you already HAVE the plane and it's not doing anything FUN IN THE BOX!!!! just take a few deep breaths, and force yourself to start at step 1. Or back up and start at Step 0 = buy a book on airplane modelling (there are a couple of dozen out there and your LHS can recommend a good one for you). There might be a few tricks and tips on how to get that "perfect" fit you're looking for.

It sounds like you're really good with your hands, so TRUST THEM (and use 30 minute epoxy whenever you can, that way there's PLENTY of time to re-align/fix/trim stuff before the glue sets!). If this is your FIRST build, just tell yourself, "this is my first build and all this is new to me so it may not be perfect THIS TIME, but the NEXT ONE WILL BE!" My father-in-law builds 18" model balsa planes so good they should be in a museum and his first build was WAY OFF PERFECT!!!! But he kept at it and LEARNED! (in fact his "Spirit of St.Louis" 22" size hangs above my son's crib )

I'm SURE it's going to come out a beauty! It really sounds like you need to be building ultra-complex "scale" planes b/c of your eye for detail!!!!