I guess it kind of depends. For the most part, I would suggest not to move anything. Pre-scent the room and that will get the snake ready to pounce...then just drop the rodent in and watch. That's what I do with my big girl.

My new little guy, however...his water-bowl-hide takes up most of the floorspace in his little tub and when I dropped the mouse in, he refused to come out, even after pre-scenting. I lift the bowl off of him and then he slammed the mouse.

Easy answer...start with the simplest solution...which is to feed in their own enclosures without moving anything....see if that works. If it doesn't...you might want to consider lifting a hide or moving some cage decor that seems to be in the way. But give the simple way a chance first.