Don't go on it immediately. Take your time, read the book TWICE. Get a list of recipes, make a menu, find out which snack foods you like. Take the time to read the nutrient section. Be sure to get magnesium and potassium supplements because the diet will have a diuretic effect early on and make you feel bad.
Most of all, stay the course! No matter what the book or anyone on this thread says you will feel like you are DYING FOR A COKE OR DONUT on the 3rd or 4th day. Take some fast walks and eat a lot of fat and you will get past that. Once you get into ketosis real good you will feel good.
This diet works. Just don't be afraid to eat the yummy foods you have been told to avoid. Eat the fat early on. Your body doesn't know how to mobilize its own fats well at the beginning and to stay in a fat burning mode you will need to eat a bunch early on. Once your body is fully in fat burning mode you will eat a lot less.
Get a blood sugar monitor and ketostix too. It allows you to see the diet working. Use the blood sugar monitor before you go on the diet to see how you are changing your bodies reaction to food.
Good luck this diet really works!
I highly recommend "Waist Watchers" sodas (WAIST Watchers, not Weight Watchers). It's made with Splenda, so it's worry-free and aftertaste free. Rootbeer tastes like the real thing. Vanilla Cream is very good if you like cream soda. The Cherry is a good substitute for Dr. Pepper, and the lemon-lime varieties are also very good. The Cola is disappointing though.