I know many snake owners conquer their fear by intentionally getting bit; that way they can see it's nothing to be concerned about.
Otherwise it'll just take time and getting used to him. I know when I got my first ball python I was pretty nervous about handling her. Be patient and be confident in handling and you will become accustomed to him.
And simply know that, though the chances of you getting bit by a ball python is unlikely, it may happen, and if it does it is no big deal.