One of the most handy tools to have is a solid range finder. You may think you can judge distance good, but it takes a long time to be able to consistently tell the difference in 20 and 30 yards from a tree. Also invest in a hunters safety life line and a good harness. When I was in my teens id climb 30 ft in a tree without either. Now that I'm older I realize that was the dumbest chit I ever did