If you are just getting the snake I would wait to really try switching it to f/t until after it has had a chance to settle in to its new home. You can try a couple times, but don't stress the snake out too much, just feed it what it's used to for a while. Once the snake is settled in and it's still not taking f/t, don't offer it anything but f/t 1 time a week for several weeks. Some give in fairly easy after 1 or 2 weeks, some are really stubborn, or never switch over.