This may seem like a very amateur question, but bear with me. I have always been an incredibly enthusiastic tree climber, in the most amateur sense of the title. I like to think I am rather good, I've never used a rope but also never hurt myself in 3 or so years of climbing pretty much everyday. I was wondering if that's something professional arborists even consider, I'm not saying free climbing with a saw or anything but maybe you need to set a line, a false crotch or investigate something, do you ever just shimmy on up? If so, to what extent is it acceptable to free-climb?