I really love this book. I work large documents for a government agency and really strain what Word can do (and what you should do with Word). This book provides intelligent answers to difficult questions far beyond an idiots guide. I'm not an idiot, so why would I use that book? I make extensive use of auto-references, links, styles, and the whole shebang to make editing and revisions a snap. There's also the Section 508 thing so that the final document is ADA compliant.
You're not an idiot, so buy this book.