Here is a little video I made. I'm not a very good video editor, but I try...
Three examples of how to feed your ball python a F/T rat using different zombie dance methods.
YouTube - Feeding techniques
The dangle: Dangle the rat, and make small movements. Too much will scare some, but move back and forth to make sure the ball python is following.
The "real-feel" feeding: Lay the rat down in front or near the ball python, and grabbing the rat from tail or foot, move it like you think a real rat would wander. Back and forth, jumpy movements, but not too fast.
And of course the overnight feeder: If the ball python looks interested, like the one above does, but will not take the rat with either zombie dance above, it might work to leave it in over night or a couple hours.
I have other methods, but I only do so much in one night! That and the camera ran out of video memory...