Have a neighbor that had a poplar fall in a storm last year (pulled out the root ball) and was asking me about how to take it down as it was hung up maybe only 30-40 degrees off vertical. He said "I was thinking of grabbing my chainsaw and then putting a ladder up.." STOP!!! I told him flat out, the words chainsaw and ladder should never be uttered in the same sentence. So he asked what to do, and I said we pull it down, then you cut it up on the ground. I had a co-worker that retired a couple years back get killed doing the chainsaw and ladder routine, and it was only small limbs in his case.
If you were looking for support for what you did here, I'm afraid you ain't gettin much. It's a bad idea. All the way around.