For treework I'm a generalist. I figure I'm *one of the top tree guys in my peer group. For surveying, my specialty is construction layout. I can go out in the field with nothing but a set of prints, and complete long term jobs with zero support. A lot of guys don't like doing it, and in recent years, a lot of guys can't. The trend seems to be making monkeys that just do what they're told. Stuff gets computed in the office, they go out in the field and do what the machine tells them to do. If something else is needed, that gets done another day after being computed in the office.
*My peer group is suburban homeowners and construction workers :^P Some of the construction guys probably know how to do some stuff, but some of the stumps I've seen left in the woods are scary. If they had to do it all day without heavy equipment, someone would end up seriously hurt or killed.