I feed in the enclosures it's pointless and not smart to try and move a boa around when it's feeding time, "cage aggression" is bs and is actually a great feeding response that most people misinterpret. When you move them in and out of tubs you risk getting bit and regurges so it's just stupid and a waste, don't feed in tubs! I hook train all my snakes, I just rub a coil with the rounded part(back side) of the hook then reach in and grab them out with my hands.