Well I'll say it ONE MORE TIME (well probably more later too):
Buy Dan Erlewine's "Guitar Player Repair Guide"
FIRST. Read up on the sections on finishing, wiring, setups, action adjustments, fret dressing, etc. You will be able to very accurately judge your comfort level with all of these when you've read detailed, fool*-proof instructions. It's impossible to judge your handiness level through these little wires - do you fix screen doors? Scrimshaw? Brain surgeon? Etc.? Erlewine's book is good enough that if you READ it and FOLLOW the instructions, you can even tell when something is going south, and adjust by asking the right questions early. But you just can't substitute overconfidence for basic competence & knowledge.... (well of course you
can, if you want a goinked guitar

).
I mean,
Brain surgery with a chainsaw is EASY, if you don't mind a lot of
dead people lying around.... :hello2:
The book is like $24 and it'll save anyone hundreds and thousands of dollars eventually, even if it's only from knowing when the "luthier" down at Guitar Center is shining you on and/or on the verge of goinking your guitar.
*(Not safe word usage, I know....

)