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I put my F/T's in ziploc bags. Then I place them in a pan of room temperature or lukewarm water for about 30 minutes. Then about every 15-20 minutes I will change out the water getting it hotter each time. After about an hour or so the rat will be thawed. Then I take the rat out of the bag, grab it by the scruff of the neck with the tongs and warm it up with a blow dryer and blow the smell at the enclosure for about 30-60 seconds. this will give the rat a definite heat signature for the snake to pick up on. Then I use the tongs to "walk" or jiggle the rat about 3-4 inches in front of the snake. If the snake is in its hide then I just walk it around about 3 inches in front of the hide. You don't want to shake it too much because if it appears too aggressive it might scare your snake. I keep the pan in the room near the enclosures with the top of the open bags sticking out from under the pan lid so the snakes can start smelling the prey thawing...