It's certainly possible but not quite as easy as the author makes it out to be.
If you look at how you spend money, you will probably find that you really waste a lot. Most of us do.
I have not read the book. The big secret is to not live above your means. A lot of people do and that's why they are in a financial bind and won't be able to use too many miracle debt reduction strategies. You have to reduce your standard of living.