I think you'll be very successful with SBD as long as you follow the plan honestly. I'm not saying no cheating but eat the 3 meals a day plus 2 snacks, fill up on 4 1/2 cups of veggies, eat protein that is lean and healthy, fill yourself and don't be afraid. It will be a bit tough to kick the bread/sugar habit but it will be so good in the long run.
There are tons of recipes that are tried and tested by us in the recipe section so you don't need to buy any cookbooks. Read the emergency handbook posted here and the updated food list http://www.3fatchicks.com/forum/sbd-frequently-asked-questions-115/
I do think reading the original book is very helpful so that you truly understand all of the principles behind the plan.
And post here, we'll hold you accountable and keep you motivated. This is kind of a pep talk to myself b/c I'lve gotten a little lax on my SBD. I think I'll read through the book again to refresh and make myself a menu plan for the rest of the week.