I feed all my snakes in the cage. I also have a schedule for feeding and they seem to be pretty used to that schedule as they will always be fidgety on those days. on non-feeding times when I reach in the cage to do anything be it changing water or cleaning I will pet my snakes so they don't just go lunging at whatever's moving without realizing what it is. Of course, I also feed frozen/thawed so I think it kinda conditions them to go more by the scent of the food than the moving warm things in their enclosures.