When do I switch to fuzzies when feeding my baby corn snake?

i have a corn snake & i feed it every wensday but here is a tip for you take the snake out of the cage and put the snake in the box when you feed it and wait till its half way down the snake then put it back in the cage i do this because every time you take the snake out to play with it the snake will think its food time and might charge at you but please make sure the snakes food is half way down if not and you pick it up it will throw it back up and mess up the snakes food schedule . (: