I second this! When youre at the petstore, maybe pick up a pair of tongs to feed as well.
I personally hold the mice while the snake strikes, coils, and constricts so that i have better control of the situation, and can then, once the mouse is in the grasp of the snake, control the head until the prey perishes.
This prevents bites, and also keeps the mouse from startling the snake like it may if it were to run freely in the enclosure.
Though, keep in mind that some snakes might need to get used to a method such as this ( some get skittish if youre hanging out watching them hunt)
Whichever way you choose to feed, ( in or out of the enclosure, letting prey run free, or holding it with tongs, Live, P/K or F/T) Is completely up to what you are comfortable with. Good luck!