I thaw mine out for 10-15 minutes using warmed water, I just set up a bowl and fill it with warm water with a tiny bit of boiling water. I then put the prey in a small bag (such as a sandwich bag) and fill that with a tiny bit of warm water too and keep it pressed to the bottom of the bowl with a pair of tongs (balanced against the wall, I'm not waiting there with the tongs). Finally I'll just heat the head and a little bit of the body with a hair-dryer. There are many methods to try, but whatever you do don't change the feeding regime.