I have been doing WW since Sept 2011(& my DH) & have lost 40lbs. I feel great even though I am not at my goal weight yet - still would like to lose another 25-35 lbs. I weigh less than I have for years.
The one thing I have to say about WW is it has helped me to make better food choices, give me an idea of what the portion sizes
should be & stick to a healthier way of eating not just a diet. You can do it ll online(what I do). They give you a number of points based on your weight & they give you extra weekly points to treat yourself once a week or daily if you choose. They also set you up for success by breaking down your large goal into smaller loss goals. like only a 5-10% loss as your first goal so you have the feeling of success & you don't lose motivation.
That's why people gain it all back because it's a diet not a way of life. I'm still not perfect & I do cheat once in awhile - heck it's summer who can live w/out ice cream with kids.
All of this was just as I was learning to make better choices of food & no exercise. In the past month & a half I have really been making an effort to use the treadmill & walk or do some form of exercise everyday. I am getting up at 5:45am to get it 30 min in & I feel good all day. It sucks it has to be so early(I love my sleep) but then if I do something else later it is a bonus & it doesn't have to be much.
Even if you don't join WW I would invest in a good weight scale & a food scale to measure your portions. We had an old scale, started with that then got a digital scale & it weighed us as more than what we started so it was like losing the same weight again.
Good Luck & post here if you want. I will encourage you what I can.