I'll add to this and point out that you should never leave a live rat alone with your snake; supervision is key. I'm always present during my live feedings with a pair of feeding tongs on standby just in case of a bad wrap (the tongs give the feeder something to bite on that isn't your snake). Other than that, just drop in the rat, maybe give it a nugget of dog food if your unsure about its temperament, and let your girl do her thing.