After graduating high school and not really knowing what I wanted to do I ended up at the community college taking courses in machine shop. They had a heat treat room that was pretty well equipped. It had several forges and anvils which I had never been exposed to before. I think that it was probably the best choice I could have made. I learned to run machines, manual & CNC, as well as grind, weld, auto cad. I was there for about two years and took a number of other courses as well, electrical, layout, sheet metal, hydraulics, welding...it gave me a good foundation, although I never did get the machining cert. I also have never worked in a machine shop though most of my employers have had at least a mill and lathe. Without my schooling I would probably still be working for the man at a dead end job.
I say if you can afford to go to school do it. At least a couple of courses. Another cool thing about vocational classes is that you can usually work for as long as the instructor is there. On days that I didn't need to go to work after class I would put in 12 hours at school making tools and other home projects. You can really get a lot out of it if you have good experienced instructors.