Get a rope over the head and drop it.
On those palms for setting a rope I throwball over top through the center of the head, pull a tough say 14mm three strand rope through and tie it off at the base on the back of the tree with a bowline above where you are cutting.
I do these first up in the mornings when there's no wind.
The mess is incredible, all that criss/cross bark flys off and then the hairy crap to rake up which can also block the saw chain.
Wear thick gloves and be patient.
