I can not state enough how much this book and the Wishbone Grip has transformed my game this summer.
If anything can show it, it is my USGA handicap. It is the lowest ever now. (brag post below

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8/3/07 1.9
7/20/07 3.1
7/6/07 4.3
6/22/07 4.9
6/8/07 6.6
5/25/07 7.2
5/11/07 6.0
4/27/07 5.6
My previous lowest ever was that 3.1 on 7/20/07 and I just smashed that. In the last month I shot under par for the first time, a 3 under par 68. I also played my best tournaments finishing 5th in a local major at 6 over for 45 holes, and finished 3rd at my club championship at 3 over for 36 holes. And that was a terrible 3 over also. I just choked, and choked, and still shot a 73-72 weekend.
I'm really not as good as my handicap would indicate. Or maybe I am. I suppose if you shoot enough "terrible 74's" or "awful 73's" eventually you just are better. Even if it feels like I am leaving 3 or 4 shots out there a round.
You can see by my trend that I ballooned from a 5.6 to a 7.2 in my first month of doing the Knudson swing. That 5.6 was more or less left over from 2006, as our season doesn't start until April 15th. Since that first month, it has just gotten lower and lower.
You get used to shooting 76, and all of a sudden, it's no big deal anymore. Then you get used to shooting 74, and it's no big deal anymore. Then I shot a great 68 and now it's no big deal when I'm around even on the 16th hole.
Knudson's swing isn't about mechanics at all, really. It is a shift in thinking. Everything is simpler, and that makes the game much easier.
All I'm trying to say, I guess, is that I'm not really anything special. I don't have any kind of genetic golf gift. If I can do it, so can anyone that is reading this. Knudson's swing requires you to rethink golf. His teachings show you a better way. And amazingly, they work. My scores are proof.
If you want to go low this year, get the book and give it a go. It's never too late to start anew.