You could probably do a search on this and find tons of suggestions.

I let the mice thaw at room temperature on top of the BPs cage for about an hour, then warm them up to what I estimate to be mouse body temperature (a few degrees higher than ours) under a heat lamp. A blow dryer probably would do more for getting the scent spread around, but it hasn't been necessary for me.

Some things that have been suggested (I never had to use any of these) to help with the transition to f/t are braining the mouse (gross but apparently effective), or getting some fresh smelly mouse bedding from your local pet store (they'll probably look at you weird but give it to you) and put it in or near your BP's enclosure as part of the pre-scenting process.