I also had out of town guest when my first box arrived. I waited until they left and had heard stories of diareha upon starting the program, so I waited until the weekend when I knew I would be more in control of my schedule. I was glad also, I had a major headache from coming off carbs and colas.
It is a really different world, but one you get used to. Just pick a few days when you can stay home if you want. You don't have to, but if you want to, then you have that option.
GOOD LUCK, and the most important thing, come here and ask questions or complain or share your victories.