Welder. It's everything that makes a skill desirable to learn. Very easy to start, impossible to master. Pays reasonably well too if you can find work. Also most welders are people who don't put up with much BS so it's refreshing coming from pretty much any other field.
Indeed. I picked up a bit of hobby glassblowing then metalwork which led me to learn welding and blacksmithing. I don't necessarily want to leave IT for it but I love these things as an avocation. Eventually, I will be good enough that I might offset the cost of my formal and informal education in these things. That's the plan, anyway.