Can't stress enough about using a good safety harness.
There are cheap ones that will leave you dangling by your waist which the sudden stop tends to be hard on,if not break your back.
The kind I prefer, slips on like a vest and your lifeline hooks in the upper back.
I get a reminder of how valuable a good safety harness is every year at spring turkey season. I let a young man(now 23yrs. old) turkey hunt on my property thats bound to an electric wheelchair, crippled from the waist down from a fall out of a tree stand when he was about 13-14.
He's very limited as to where he can go but usually kills a turkey every year which puts a smile on his face.