I read this and I instantly think: Darwinism.
Mahnertree, your ignorance on the issue should be evidence that you need some more formal training. This isn't a pissing contest and I don't climb trees, but I do have some experience rock climbing and can tell you that you need to get some direct instruction. If you can't figure out how to put a pair of spikes on your feet, what makes you think you're going to know what do do (or what NOT to do) when you're 50' up in a tree operating a chainsaw?
Again, I don't know the answer... but I have the foresight to know when to get help. Posting to a forum might be fine to get direction when you're cooking chili but for something as dangerous as using chainsaws while swinging from a multi-ton object... well, it's time to get direct consultation from a professional (i.e. in person). I think you're asinine to try it on your own with only a forum post and YouTube videos.
Sorry for the candid response, I just hate when people over estimate their abilities in any sport.
My ¢2.