Carl,
I have to agree with everyone else. All the safety issues as well as the goofy body position. Use one hand only as a last resort, and usually when you need to reach way out and below.
Main thing is, most of us suggest losing the idea of leaving lower branches when doing a removal. The idea is simply daft. It is super easy to get a branch to drop where you want it, or handle it and make a neat ground pile..cool if you have no ground help...which is not a good idea, working alone, ya know.
Many climbers wouldn't bother setting a lifeline, and most western spur climbers (read untrained hacks) wouldn't even think of it. I might do a high set, but only if it was easy, otherwise I'd just tie in a bit above me as needed if I wanted to reach out a ways to shorten the length of the branch being cut.
Re helmets, I have a Pacific, pricey but worth it. They are kevlar and superior to plastic petzl's, and only a bit heavier. Nothing wrong with a $10 hard hat though, just get a chin strap. Available at Sherril now too.
MasterB, your idea of cutting the heck out of the brush on the trailer is only a good idea if it's a dump trailer. Makes it too hard to unload. I speak from experience, as I worked out of a pickup from 85 to 89, just hiring chipper subs on bigger jobs. I would dice my loads but only a bit to compact, and load the branches butt to the front, with a one foot gap behind the cab, then flip the load out. I rarely had a dump where you could tie off a rope (laid underneath) and pull the load out. I often used to get over a ton of brush on my old 3/4 ton twuck.
You're a good kid, don't be afraid to learn from us, just the few of us here so far have close to 100 yrs experience.
Hey Nick, got your Tree House Video yet?
Here's a shot of what was left of the pine that took close to 65 manhours to do. Stump grind was $300, plus $200 to haul the chips...stump was a 5 footer.