I joined weight watchers!

I have been working on weight loss since October and have lost 30lbs but have come to a stand still. Groupon has a deal for weight watchers and after reading the reviews on their new system for smart points I decided to go for it! I have about 80-90lbs to lose and would love to be down about 40lbs before TTC.
Has anyone had success with smart points? Any tips before I go to my first meeting on Tueaday. I guess just looking for some feed back and encouragement :-)