Funny - I logged in to ask a similar question and this was on top.

I might own a file and be able to assemble an AR-15, detail strip a Glock or change my oil - but that’s the limits of my handwork, total newbie to filing and fitting and machine tools.

Who offers the best novice courses? The NRA summer programs? I’ve looked at C&S, Vickers, Garthwaite, Rodgers who all offer a five day type course, but don’t want to waste time (including my own) since I’m starting from zero.