Don't Waste Your Life Study Guide is a great companion to Don't Waste Your Life! It breaks the book up into ten "lessons," and each "lesson" is five "days" long. (You can, of course, work at your own pace if you're working alone. I did it with a group.)
Each lesson begins with a clear objective, and tells the reader which chapters to read in the book. Then there are 3-5 thought-provoking reflection questions each day to answer. Not overly time-consuming, and really deepens the impact of the book.
There isn't a separate Leader's Guide appendix or anything; everyone has the same information.
I do recommend this accompanying guide to Don't Waste Your Life!
*I downloaded a free copy of Don't Waste Your Life Study Guide from the author's website, http://www.desiringgod.org/books/dont-waste-your-life. As of 12/30/15, it is still available there for free. Awesome!