How far into the book does it hit? I would figure that it would be a chapter of him meeting the family and getting food prepared and then the next chapter we would know that it was coming.
He prepares and stuff in 3-4. End of chapter 4, beginning of 5 is where everything gets explodey. Make sure you know all of the character names at this point, because you'll start to get confused if you don't.
After that, it's about survival, and it gets pretty creative. Randy turns into a badass in short order.