I'll add one thing - be very gentle! Avoid grabbing, constricting, or otherwise restricting the snake's movement (except, of course to keep him from wandering off!). No sudden or jerky movements, as these can leave the animal feeling threatened. Everything should be gentle and gradual; let him crawl through your hands/fingers, around your arm, etc. The idea is to have him recognize that you're not a threat. Eventually he'll come to recognize the drill as a non-threat, and will respond with more of an air of curiosity. He should even come to enjoy the warmth of your hands/arms - after all, they're like soft warm rocks to a snake!
You still may get nipped on occasion, or musked, but hey, that's all part of life when you own a snake!! michaelb
PS, If he's about to shed (blue-ish eyes) or it's getting close to feeding time, those are times when it's probably better to just let him be - until after he's shed or after he's had ample time to digest his meal (at least a couple days).