Well a few years ago when I was about 16 I seriously was thinking about getting into the business. I bought a saddle and some rope heavy enough to hold me and then some within it's safe working load. I kind of got discouraged, maybe my sense of fear kept me from doing something really stupid. Who knows though, if this site had been around then, I might be an arborist now. My advice is go for it, but the best thing would be to make friends with a decent tree surgeon in yoru area and learn the ropes from them. After finding this site, I've kinda been bitten by the climbing bug again, not neccessarily to work in the industry, but just to climb again, or perhaps to work on the side, who knows, so I will be following your progress with great interest. Look into the links above for your climbing gear. It seems that Baileys has slightly lower prices than some of the other places, but Sherril is also great to work with, bot of those places are great from personal experience, best of luck,
J.D.