I also feed in the enclosure. One thing I do is pretty much let my ball tell me he's hungry. I feed F/T (frozen/thawed) mice so I actually do the thawing on top of his enclosure.

If he is hungry he'll show it (coming out of his hide or just sticking his head out of his hide with tongue going crazy). Once he shows this I place the mouse in a ziplock bag and soak in the hottest water my tap produces then take the mouse out and dry it. The drying helps a LOT in preventing bedding getting stuck on the mouse and eventually in the snake's mouth.

I then feed with tongs. That's just the way I do it, you'll adjust according to how your snake acts in time.