^^ Waiting 48-72 hours is typically a good rule of thumb to follow when it comes to handling after feeding. As others have posted, once he's ate for you a couple times, you can start handling more regularly. I start with 5 minute sessions and work up to 15-20 minutes sessions.

BPs are notoriously shy and solitary animals that don't particularly like being handled. Most of the time, they will tolerate you, but hissing and posing in a defensive position is a good indicator that your snake is scared and/or stressed. When it does come time to handle, use calm, confident movements and don't dally around, e.g., do not move your hand in and out of his viv numerous times. This will only stress the snake out more and you will have a greater chance of getting tagged (which will not hurt). Pick him up on your first attempt.