Regular, persistant, and gentle handling will help. Sometimes it helps to sit down so the snake is more in your lap than in your hands. Try to move more slowly until he gets comfortable. Don't put him back if/when he strikes at you or he could learn that biting gets him put down. Try to be confident while handling too. Often boas act nervous because they don't feel physically secure. And some boas don't grip as well as others....
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