Agree with above post about waiting for your new snake to have eaten 3 times at normal intervals before any handling. Even now, I'd suggest you go with that, as BPs
don't have any way to really show you they are distressed...they're usually mellow, but that doesn't mean they aren't scared of you, & it's way more important that they
eat for you in their new home. Stress can turn that into a battle, and trust me, you don't want that.

Our approach is the scariest time for any snake: until they learn to recognize us by our touch & scent (remember they don't see well or generally know us visually), they
instinctively assume we're a predator coming after them, so do your best not to seem scary. A gentle touch to their body (not head or tail) often helps, while many snakes
do fine with our scent instead. A tap either on the hide or the snake (gently) is another way to signal you are familiar. Snakes in the wild learn their way around, so they
also learn such cues when kept as pets.