I haven't read Authority yet, but it is on my to do list. I did do most of what they suggested in this article though for my book[1] except one thing. That is price it high and do multiple packages. I think my biggest mistake was having Amazon as an option because that limits me to selling for $9.99. It hasn't been a total failure, but it hasn't made the ~5k these examples did, and I'm pretty sure pricing is the biggest reason why. I suspect most of the people who bought it at $9.99 would have also paid a higher price, especially with additional resources in a package.

[1]http://buildanappbusiness.com/