I got interested in climbing a few years back to save a bunch of money on tree work for limbs over my house.  It was kinda the same except I was able to find more primers to get me started.  Now I can do my own tree work... SAFELY, and I've helped some family and friends with my new skill.  There is a lot of stuff to know and jargon, teniques, tools, styles, math and such that go into climbing for fun or work.  However, finding a place to start with that was a whole lot easier than getting started doing any kind of developing or coding, at least as far as my efforts are concerned.