E.B.
I did Weight Watchers for the first time and lost 20 pounds, and used the idea loosely to lose my 50 pounds of baby weight. I found that the easiest way to make sure you're losing weight is to drink a ton of water. I also bought Cooking Light magazines - the nutritional information is at the end of each recipe so it's easy to find out how many points it is, and because it's real food, you can eat what feels like normal portions but still go easy on the fat and calories. Plus, trying new and interesting recipes (if you like to cook) tricked me into thinking I was eating more decadently that I actually was.
Good luck!