I did carpentry work for the last seven years. I never bothered to go to school for it though, which I regret a little now, though I doubt having my license would really help due to the lack of building going on. It just didn't seem to make sense at the time. I worked for the same company for like 5 of those years and as I got better and learned more I just kept getting raises, so it didn't seem to make sense to take time off to go to school when I could work and make money instead. :P