Everyone who plays my bass loves my straight neck/low action set ups. I do all my own neck adjusting and intonating. Electric guitar and bass. Where could I learn more if I were considering a career as a repair monkey? I'm no stranger to woodworking (spent 3 years in a furniture building shop).
I have learned everything I know by research and even more so, trial and error. I do guitar repair on the side, but I wouldn't dream of doing it as a career. Its more of an extra income thing for me.
Start by reading everything you can find on the subject, both in book form and online. If you don't have it, get a copy of Dan Erlewine's book the "Guitar Player Repair Guide". Check Frank Ford's site frets.com. When you have absorbed the rich material in these and other places, take on part time work with an experienced luthier/technician and put what you have learned into practice.
If by "go" you mean actually go somewhere to study then the logical choice is Bryan Galloup's school. Adding to Turnaround's list, Dan Erlewine's video series is excellent.
Same approach. Read everything. Study, study, study. On weekends/evenings take on some work from a local shop and learn from the regular tech there.
find you some ultra cheap worn out, used up guitars and basses and practice practice practice. The last thing you want to do is be working on someone's 5A flame topped Les Paul with a $1500 electric purple fade on it and have an aw s&!t moment with a screwdriver. Make your mistakes on your own practice instruments before you take on work from others.