One thing I will never attempt myself is tree removal/trimming.
I helped my buddy remove a tree yesterday and spent the whole time waiting for a disaster to happen.
He rented a cherry picker and watched a couple YouTube videos and thought he was good to go.
No one was seriously hurt and only one limb landed on the corner of the roof doing minimal damage.
I did get to see 2 50yr old men fly about 2 feet up in the air and 5 feet to the side when the limb they were cutting was heavier than expected (think pulley system designed to lower limb to the ground.
Eventually the base in the picture was the only thing left, they tied a rope around the cherry picker and used that to pull it in the direction they wanted.
Somehow it worked.