If I could make a quick suggestion, I'd order "Divorce Remedy" as well and read that first before DB. It covers most of what's in DB but is a bit more straight forward and well organized. Best of all for you, there's an extensive chapter on affairs that I think you'll find extremely helpful in your situation. After you read DR, I'd follow it up with DB where Michele gets into a bit more detailed.
I think your mindset right now is definitely on the right track (about you changing yourself for you). I hope when you read DR and DB, you'll smack your forehead and wish you got them sooner!
- Me = 32 y/o - WAW = 32 y/o - M = 2.5 yrs, T = 12.5 yrs - No kids - Bomb, WAW moved out, D filed = 8/15/08