As has been already stated, regular handling is pretty much the only way to get them to calm down in the long run unless there is some other issues with husbandry.

If your concern is being bitten, I would recommend a relatively thin glove. Their teeth are not that long so any thin glove will do. This allows you to pick up the snake with confidence (which the snake can sense I feel) and it will get the snake used to handling. Once you pick him up, slip the glove off.