You might consider asking any local smiths if they want a free hand some evenings. Maybe sweep floors and other menial tasks in exchange for a little knowledge. I looked into some of the correspondance courses, but don't see a heckuva lot of value to them. They might be somewhat beneficial if you're a person who can pick things up through reading, but in that case you may as well save a few bucks and just buy the books.
Look around, there might be a hobby machinist's evening or weekend course available to boost your skills. I find myself wanting to get a little more involved than mounting a scope or bedding an action too, but there's a sharp learning curve for some things. Buying guns that need TLC is helping a bit...