I won't get into the other details, but I would strongly advise against thawing f/t in boiling water! That way you're gonna cook the meat, which can (and likely will in the long run) make your snake sick. Also the feeder could potentially, well, explode. Microwave is also a big no-no.
What most people do (from what I can tell) is put the frozen feeder over day in the fridge, or for a bunch o hours at room temperature, and afterwards put it in warm water (no hotter than comes out of the tap) for 10 minutes to get the body heat up (might have to refresh the water at halftime)