I just don't get what makes someone a pro. No disrespect at all to some of the Asplundh workers, but some of them don't look all that professional. There can be moron farmers, moron homeowners, and moron pros. You can't lump every in as one. I know some homeowners that solely heat with wood so their well being depends on running saws and they are super safe individuals that wear all the safety gear.
I'm not a pro, but I started using a saw when I was 12. I wear chaps, steel toe boots, gloves, eye and ear protection. I've actually bought books on cutting trees and I've cut a heck of a lot of trees. I'm not saying I'm perfect, but there are trees I know I can take down and there are trees that I don't mess with. It's not worth my life for a tree.
To say only a "pro" can run a pro saw is beyond silly.