Anyone that suggests ratchet strapping a ladder to a tree and climbing with a Sawzall needs to be reading posts, not posting here. If you read the intro to the Homeowner helper forum you will see it says this is where homeowners can come to get advice from the pros. Furthermore, if you had read the OP's posts better, you would have noticed he was specifically asking for climbing advice, and how to cut it with a chainsaw.
And finally, if you think ratchet strapping a ladder to a tree makes it safe, you should watch more youtube. If that branch swings around and hits the ladder it's still going to bounce you right off.