If you were at an average pet store, their personnel have minimal training. It is difficult to sort out all of the information. It's not the end of the world that he ate twice so soon, but I would recommend giving him the week to settle in like Robin said. You won't really see the true personality of the snake for a month or so. There's all sorts of stuff you hear about, like feeding in the tank will cause aggression. I was so worried about that at first. Now I feed in the tank. Listen to those people who have kept bps for MANY years. They are a wealth of knowledge.