Four years of machine shop school while working full time in a machine shop. Worked for years making well heads, threading drill pipe, making bush hog gear boxes out of raw castings and all associated parts. Learned how to program CNC machines and made tons of money doing that!! Then went to work for the government making aircraft parts in the machine shop then graduated to Tool and Die shop. It was a blast and I made a lot of money. Was also machine shop supervisor in a few shops. The more you learn the more valuable you become. I'm retired now but still get job offers every time I go into a machine shop. Always try to take on the the more difficult jobs and your boss will love you and you will become irreplaceable. Machines shop machines can be very dangerous so keep your head in the game at all times, I've seen some pretty nasty accidents over the years. Protect your ears!!!!!