I don't do fretwork either. I just got some nut files, and I don't think you need any other skills other than a sense of sight, LOL. And well, another guitar that plays well/intonates well to compare at what depth the nut slots should be at. It's not hard, really.
At least when "fine tuning" a Graphtech or similar nut. If you're cutting a bone note from scratch, then yeah, probably more involved process.
I hate soldering as well, but if it's something I can do, I'd rather learn to do it myself than pay someone to do it, and then have to wait to have my guitar back.
I think if you learn to do the more simple guitar setup/tech-y things, and invest in some simple tools, not only can you save a lot of money, but get guitars that play and sound better by your own standards.
Again, you don't really have to if you don't want to, but you seem pretty knowledgeable about recording, frequencies, guitars in general. I don't think it's going to be hard for you to learn other more simple skills like dissasembling a pickup and putting it back together. It's just unscrewing some screws and sliding a magnet in.
It does help if you have a compass around to know which side of the magnet is north, though. It's a PITA to put the guitar back together and realize your middle position is out of phase.
But yeah, the pickup thing is not more complicated than actual pickup swaps. The most involved processes are mixing coils and whatnot, but even those are not more complicated than the average pickup swap either. It's MUCH easier than the other tasks you mention not doing yourself.