I'm working on switching all of my snakes too. My two adult red tails were easy - but they also came to me pretty underfed and hungry. I haven't tried yet for my two young Nic boas - they'll get their first try this Wednesday.

For my two sub-adult ball pythons, I fasted them for a couple weeks. Then I scented the room with my pet rat, and I also had a Kritter Keeper that had housed a live feeder for about a week. I thawed the mice out thoroughly and made sure they were nice and warm, especially around the head and chest. I put the snake in the Kritter Keeper, and then put the mouse in too. Instead of dangling them by the tail, I used the tongs on the scruff of the mouse's neck and made them "walk" around the container, occasionally towards the snake, occasionally away from the snake. Eventually they got really interested, tongue-flicked like crazy, and bam! That was that. It was actually easier than I thought it'd be.

The tough one to switch will be my adult ball python. He's a picky eater anyway. I'd tried him on F/T before and he refused, although it might have been that I didn't get the rat warm enough or other errors on my part. I plan on trying again soon though.