I have trained quite a few people...(some could hardly spell their name, some college grads). Either you get it or you don't. Is "tree work" something that can be taught? I say kinda. One of the best men I ever worked with fell into the category of "simple" yet he could do trees.
Can tree work be learned?
Kinda depends on what aspect of tree work you are talking about. For now I will assume you are talking climbing trees to trim or remove.
I would say yes, 95% of the population could be taught to do tree work. Afterall if we are talking useing ropes and cutting then yes most could be taught enough of the basics to do the job. Could 95% understand the all the physics behind it, no but then how many of us truely understand the "and" "or" "nor" gates on a microprocessor, yet we can still navigate around a computer pretty efficiently. Could 95% of the population handle the fear factor? No, I would say about 50% of the population could handle the fear factor. Could 95% of the population handle the physical aspect of it, no. I would again say about 50% of the population could handle the physical aspect (meaning both endurance, strength, and cordination) of the job.
So all that being said, 5% will never be able to understand it, then 50% of the remaining 95% are out the door because they won't be able to handle the fear factor leaving you only 47.5%, then another 50% of the remaining 47.5% will have
the physical ability to do the job, leaving you with only 23.75% of the population able to do the job of a tree climber.
Of that 23.75% it can be further broken down to with other demographics like age, location, other job opportunities, etc, etc, and the end result is that only about 1% of the population will both be able and in a situation to want to become a tree climber/worker.
Of that 1%, only 10% will have no fear, be intelligent, be in great physical shape (remember I'm not talking "greek gods" I'm talking the whole aspect of what is considered great physical shape), and not have other factors such as drug problems or other issues that
affect their ability to do a great job making them "the best of the best". Then there is the motivation factor which is a whole other factor/subject in itself. The remaining 90% of the 1% will be somewhere in the middle between poor, average, and good.
Me, I'm poor to average. I say that because I don't climb much. When I'm climbing full time, I'm average to good. I have my moments of greatness, but then I have my moments that are.....well less then great.
Kinda like I was watching an Indy race back in the early 90's and they were saying that your average driver (take away fear factor, physical conditions, and intelligence) could take those Indy cars around the track at 210mph, a good driver could take it around at 215mph, but it takes a great driver to take the car around the track at 218mph. I think the same probably applies to tree work.
Just my thinking.