Be gentle but persistent. Daily contact with each other will begin to establish a level of trust and confidence between you and your snake. When it is comfortable with you, you can begin taking it around the house. Always be gentle, and try to avoid sudden movements. If the snake wraps around your arm or neck, you can unwind it by gently grasping it's tail and gently unwrapping it from around your neck or arm - do not try to unwrap it by moving the head.
Some snakes are a bit sensitive about being handled soon after they have eaten.
If you feed your snake out of it's enclosure, go ahead and replace it back into it's enclosure after it has finished eating. Then leave it be for a couple of days. As the snake gets more comfortable with you, it will be less nervous and less likely to give you back your mouse. It is always fatal in pythons. Unfortunately, the lust to sell has overcome common sense in private breeders as well as pet stores and wholesalers, and an increasing number of boas and pythons are being sold who are infected with this virus.