I know two men (brothers) who are tree surgeons. They have all the qualifications and the correct protective clothing for the use of chainsaws. They've told me some ghastly horror stories about accidents with the things. I wouldn't recommend any 'amateur' buying one.

Our aforementioned neighbour was far out in the countryside working alone years ago, and he sliced the tops off all his fingers on one hand with a chainsaw. He had to run to a nearby cottage dripping blood and get them to call an ambulance. He now has very short fingers and no nails on that hand. Makes me shudder...