I feed both live and f/t. While it would be nice for all of my snakes to eat f/t, I doubt it will happen.

There's risks to both f/t and live. I prefer frozen due to convenience(I live 45 mins from the pet store).

If someone won't eat live, I put it back in the mouse tank I have for them.

A lot of people recommend defrosting the mouse onto of the snakes cage. Once it's thawed, take a hair dryer and warm the mouse up, concentrating on it's head. By doing this near the snakes tank, you are prescenting the room.

Switching to f/t isn't always easy and will take time and patience. You might have to offer multiple times in different ways before your snake will decide to eat it