If the snake is eating F/T it's much easier to get them eating live. The problem is that they might not be able to go back to eating F/T just as easy. I feed mine F/T, because I can keep a freezer full of rats, instead of having to go buy one every week (not always convinient). As for feeding technique; I defrost the rat, by putting it in a ziplock bag and soaking it in a bowl of hot water. I usually have to change the water a couple of times, because the water will cool, and rat might not be fully defrosted yet. Once warm I take the rat by the tail with a pair of tongues and dangle it in front of the snake. He strikes and grabs the rat, and I release it. Then I just let him do his thing.