While we're on this topic, I actually did some arborist work of my own this past fall. I don't know much about the technical skill of true arbor work, but I used to log commercially and got to be pretty good with a chainsaw. Later on I spent a couple years assembling cranes for a living, and got comfortable working out of a manlift assembling boom sections.
So when I decided that we needed to remove the three large oak trees hanging over our house and yard, I decided to give it a try on my own. I rented a tow-behind 35' manlift from a local equipment rental company and got to work with my trusty Husqvarna 562. I hitched it to my Mahindra which made for easy maneuvering and repositioning.
The trees leaned heavily over the house and yard, with powerlines on the uphill (right) side of the yard. This prevented me from being able to drop them whole. I went up in the man basket and just started with the lowest branches and worked my way in towards the trunk cutting off ~3-4' sections at a time. I worked my way up the trees until just the stem was remaining, then cut them down in 4' sections until they were short enough (10-15') for me to cut them at the stump.
I was very cautious about dropping limbs and trunk sections well away from the base and boom of the manlift. I worked by myself that day, as I usually do, so I didn't get any pictures of the work being done unfortunately. However, these are some pictures of the trees and yard before, compared to just after I finished cutting them.