I was a bike mechanic and ski tech for a few years when I took a job at a gear repair shop. We fixed broken tent poles and repaired stoves. It was an interesting, dynamic job that required critical thinking on a daily basis and challenged me quite often. Not because it was super hard, but because we had no training program. They hired you, put you on the schedule to work alone, and then people started coming in and asking the guy behind the desk (you) to fix their stuff. I can't imagine that the first few tent poles I fixed lasted all that long, but you figure out what works after a couple tries. I could have used a bit of training when I started, but now that I look back I'm happy that my boss assumed we all had adequate common sense to figure these things out on our own.