I do the little stuff myself. All the basic set up stuff is not really a problem for me, although I had the rewiring of my RG2127X done by someone else coz it's a bit too busy in there for my liking. Plus, I needed the knife edges of the trem worked on, and there's a tiny pain in the arse cable that runs from the saddles to a PCB in the control cavity for the piezos... yeah, not touching that.
Basic stuff like intonation, truss rod, nut filing, saddle adjustment (acoustic), etc., I'll take care of. Frets? Hello Mr. Tech!
Most of it I guess coz when I started out as a kid, I didn't have the money to pay someone to set my guitars up, so I just read what I could on the internet and screwed around with it myself.