I concur with normal - - as for switching to f/t - - I've successfully done it with two balls. Reduce the size of the feeder by 1 (ie: go small rats instead of medium), but feed 2 items. Feed the first live, then fresh kill the second and tong feed. Once they're in feeding mode, they'll take it quickly. Two weeks later (or whenever you normally feed) Feed the first live, then feed the second as a F/T. Next feeding Fresh kill the first, feed the second F/T. You get the idea - - use two smaller feeders to gradually make the switch. It seems to work well.
Ummm. Too easy. Its childish, but I chuckled when I read that.
With my snakes I start with just trying a f/t rodent of the same size. Sometimes tease feeding will get them to take it the first time. If that doesn't work I typically give them a week and try again. The second time I try I will have a live mouse get the snake interested. Once it acts interested I switch it out for a f/t mouse. That typically does it. Sometimes it doesn't and I just keep it up until they finally take the mouse.