Mine will not fire unless there is an arrow in it so I plan to remove the arrow and lower it till it is about 6 inches off the ground. Then remove it from the rope after I climb down. Then fire the decocking arrow after I get to my atv. You might want to look for a rotten stump and put it near your treestand so you could shoot a decocking arrow into it before you climb down. This will be my first season with a crossbow too. If what I am planing to do does not work, I will come up with a plan B.
When you are up to your butt in alligators, it is hard to remember your intent was to drain the swamp. Stay focused!