Wow, sheltered world you live in. Been there thousands of times, maybe a few hundred for truck pulls, few dozen for Tirfor pulls. When the rope is set high in a tree, you have tremendous power on it. If the tree has decent holding wood, you can do a lot by hand, even if it has somewhat of a sidelean. On trees with a substantial side lean, or those with not much of one but weak holding wood (cottonwoods, maples, etc) you need power and most of all speed, thats where a truck shines. Tirfors are only for pulling trees directly over backwards, unless they only have a small side lean and good holding wood, like Douglas fir.
If you not comfortable, climb up there and piece it down. I would rather yard big snotty trees hanging over the three phase down with a bull rope ran though redirect snatch blocks to a boom truck. Whatever floats your boat, I guess.