I love my Milwaukee 6"chain saw, it's light, powerful, fast and last a long time cutting. One of the reasons it cuts so much better than others is that the chain has a tooth on every link, not every other. That takes the vibration out and makes it very fast. I have both a pole pruner with saw blade and a chain saw attachment for my Echo weed eater. Both work great.
Just had a friend three weeks ago tried to cut a limb in his yard. It was about 30 feet off the ground, he fell and broke neck and back and punctured his intestines and other injuries. Two weeks in the hospital and in neck and back braces for next 4-6 months. The limb he was cutting fell on his wife and broke her ankle and she will be off it for 3 months.
That story is a warning to me and all you, tree climbing and working on a ladder is for youngsters, not us antiques.