I do the fridge the day before for small feeders but really large feeders get at least 2 days in the fridge.
Place in warm water untill warm all the way through.
Feed to hungry snake.

I place directly in water only because I feel like its a little "bath" or rinse before my snakes eat. Rinses off bedding, poop, or anything else that may be stuck to them. I have had trouble with some going after wet rodents. For those picky eaters I have used hair dryers and warming in baggies in water so they don't get wet. The latter is much easier.

I'm going to try the temp gun to see what temp I actually am feeding.