I trained my husband how to do them,and was scared! I have seen him hammer a nail into a board and was terrified!

He did a great job. Learn to relax your muscle. Even if its a fat shot. RELAX! The more relaxed you are, the less it hurts. Breathe. relax, and let go. in time you get used to it.

If that person makes a habit of being a bad shot, dont be afraid to fire them.