I always fed my kingsnakes frozen. First of all, feeding your bp, I wouldn't suggest mice. Most people (esp. on this site) that I have chatted with about feeding tell me to try and switch to rats, which I have been attempting. Now to your questions... Getting your bp switched to thawed will be pretty tough to pull off. I would first suggest starting with pre-killed rats. Just put them in a bag and smack em against the wall or something. After your snake eats a few freshly pre-killed rodents, you can try offering a thawed one. Thawing a frozen rodent is pretty simple. I usually put them in a ziplock bag sealed, and then fill up a cup with piping hot water. Put the bag in the water, and I usually have to get another cup and stack it over top of the bag so the bag won't float. It takes about 10-15 minutes, simple as that . Let us know how it goes, btw.