Imagine working on a crossword puzzle and having some success, but being largely bewildered about what particular letters actually solve the puzzle. Imagine deciding after scratching your proverbial head for a very long time, you decide that you need some help. You turn to the back of the book and take a peek at the answer key. That very sensation--that relief, the recognition that relaxes you, that realization, "Wow! I never would have come up with it," the feeling like someone just turned on the light and you would have done it yourself but you didn't know where the switch was--all of that is what reading this book is like. Don't hesitate. It's amazing.