I feed live, and unless my girl is super hungry she's not an aggressive eater. With clean hands I remove the empty hide and the center clutter. I then lay a (1) rat filled critter carrier on it's side and gently let the rat out. If she does't rush out I remove the other hide. I monitor but from a few feet away with no lights on inside the cage and let the shy girl do her thing. If I have a leftover situation I use my critter carrier and a "stick" to guide and collect the "uneaten portion" to safety, but I use one of the hides as a block or blind between the snake, myself, and the rat. This works way better than fishing about for a fast moving leftover rodent.
Temps first, always.