You definitely don't boil it.....you literally just leave it out to thaw (like you would chicken?) and then get a bowl of hot water from your tap and just leave the rat or mouse in it for 10-15 minutes or so. You don't even need to step foot in your kitchen for this...
There are literally thousands of people who feed their reptiles this way, myself included, and it alleviates dealing with a live rodent...it's not as crazy as it sounds I promise.