For the sake of your snake, I would strongly recommend that you make every effort to feed f/t. There are too many stories of prey items doing horrific damage to snakes. There are some snakes out there that will only take live, but don't give up too quickly when trying to make the switch. With patience and work most snakes can be switched. Good luck, and if you have any problems ask for help. There are many different techniques you can use and plenty of people here willing to help you through it.