first off, i would most definately by the book.
second, as a tip you would probably already know, a lot of books have reviews, summaries, tips, and other information (as in what website you can go to for help) after each chapter.
The best idea to go for is, dont just write a book, write a book you'd want to use yourself in the off case you lost all your memmory.
hey, amnesia's possible...