I pull mine out of the freezer, and pop them into freezer bags.(the nails on the rats are less likely to puncture a freezer bag ) Place in a bucket of water for about 2-3 hours. I check on them periodically. Once they are fully thawed (mushy belly) I replace the water with extremely warm water. I let them sit for another 15 minutes or so, to warm up, and then feed. No fancy process here.