Not trying to make this sound rude, but I'm just trying to offer some sound advice, so here goes: Whenever you feed a snake, especially ones that you'll be handling, it is always a very good idea to always take your snake out of the cage that it 'lives' in, and put him/her in a tub, box, or on a towel on the floor (my snakes notice that when I lay towel on the floor, it's feeding time!).
Which is why you need to feed them outside their cage, soon they will associate you opening the cage lid with feeding time, and in actuality you're just reaching in to take them out for handling, and they strike based on what they know/learned. For me anything to lessen the odds of getting bitten, is put to use, as I've been bit a few times, and it can be kind of startling...lol.