That helps, thanks! Yes, if a general overview will help, go for Anne's book. It will definitely make you more comfortable and give you a much better feel for the process.
Reading other great essays can help, but it can also be frustrating since so many of them revolve around a really unique part of a person's life, one that it isn't easily matched by others. A good place to start is with:
The PowerScore Ultimate Law School Personal Statement Resource List. If you have time, watch the first seminar on that list—it's one I did a while back, and it covers what the adcomm wants from your statement, how to open the story, and things to avoid. I think it will get you up to speed pretty quickly, and definitely change the way you look at your statement.
Thanks!