I can't stand books that include a "How to use this book" section. Quit stalling and present your ideas. If readers don't have the good sense to take notes or take time to answer questions presented in the text, then your writing sucks. I know you get paid by the page or by the word, but I'm not fooled. Don't waste our time. I say "our time" because when I read your book, I'm sharing my time with you, the author. Don't be frivolous with your customer's most important commodity: their attention.