Evo, this scares the heck out of me too. I had to cut down some trees recently. A friend and I used a chainsaw on a tree about twenty feet from my house. We planned it carefully, put a rope around the tree over a high branch, my friend started our cuts, I was holding the rope (rope was just in case), the tree started to creak and began to drop backward toward the house. The trunk pinched down of the saw and shut it down. I ran and got my garden tracktor, attached it to the rope and pulled it over in the right direction. We were lucky. The tree looked like it should have fallen properly, we cut it correctly, but the overall shape of the tree put it's center of gravity too far back toward the house. If we hadn't put the rope on first it would have hit the house.
1. Use ropes (The come-along or winch that BT suggested is a great idea).
2. Look at the entire shape of the branch.
3. Acess the fall path as best you can.
4. Plan your own escape routes and open them.
5. Don't work on this alone (at least get someone to watch you.)
6. consider what will happen when the branch hits the ground. (will it hit and roll, hit and spin to the wrong direction, hit and spring, etc?)
Please be careful.