Welcome to the Beck world, vegasgal
Yep, the Beck strategies are just what's needed to stick to a chosen eating plan. Confidence builds as you acknowledge that you're not only sticking to your plan, but that you know that you have the skills to continue to do so. Most of us have a history that includes weight lost and then regained (plus some), when we charge forth using our gut intuitions to stay the course. Seems that it's our gut intuitions that helped us gain the weight in the first place and they help us put it back on.
My take is that your best bet is to work with the single Beck book that you've started with. In the years ahead, there'll be plenty of time to try the Green book when you're ready for a refresher.
Please join us on the thread where we post our daily progress to use each other as online Diet Coaches - Beck Diet For Life/Solution – July 2012 – Support, Discussion, Buddy/Coach