I agree with Andrew21. Assist feeding cornsnakes, espeically babies, can be dangerous and their tiny little jaws can be injured easier then balls. I've heard scenting with a lizard works well, I don't like feeding my animals love but a live pinky can jump start a picky corn. Another good (but rather gruesome for some) technique is cutting open the pinky's head. Is called Braining and I've heard good results from it.
-A