I've lost 31 pounds and maintained that loss for a year and a half. I went from 175 to my current 144, from a size 16 to size 8. Woo-hoo! Husband is happy. And so am I. Fyi I'm 37, work, and have 2 kids.
Here's how I did it. I hope this helps someone out there.
1. Ate what I always ate, just smaller portions. A small bowl of pasta, not a big bowl. One veggie hot dog, not two. Three slices of pizza, not six. Etc. I eat pretty healthy anyway (no fast food), so the type of food wasn't a huge change for me. The one exception to my small portion rule was when I'd make something really, really healthy (a salad, or a veggie stir fry). I'd take advantage and eat as much as I wanted on that stuff. I drank what I always drank (water, chocolate milk, OJ). I think the biggest change in my actual eating habits was switching from peanut butter to sugar free jam for a few months, initially (I'm back to peanut butter now, but a thin smear!) Also, fyi, I didn't try to "bulk up" on water like some books recommend. I've never been a big water person.
2. Exercised. On a good week, I'd do a short walk (1/2 hour), a long walk (1 hour), and one step aerobics class

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3. "Watched" the snacks. Never eliminated the treats, just kind've kept an eye on them.
4. Weighed every morning, and never let myself lose more than 1 pound a week. If, mid-week, I saw I was already down 2 pounds, I'd increase the portion size/treats a bit. I learned this from a cousin who lost 60 pounds over 60 weeks or so, and has maintained that for three years. It kind of served as a "pressure valve" so I never felt deprived.
5. Read the book "Thin for Life" religiously. Every night. The same paragraphs again and again. It's a book based on a study of people who had lost 30 or more pounds and maintained that loss over at least a three year period. It repeatedly assured me that "Yes, this is doable."
6. Didn't stress too much about the invitable slips and the occasional binge. Decided this was a long haul thing, not a short term thing. Overall, I thought, if I am eating well and exercising, the weight will come off. To this day, I sometimes go nuts and eat something very bad in big quantities. But I just "watch" for the next day or two and make it right. In other words, the status quo is always eating healthy. The binges are the exception to the rule.
7. No tempting food in the house, at all. Yes, that meant throwing out perfectly good "treat" food at times (when I couldn't find anyone to take it)! That was probably the most painful thing during the whole experience.
8. Overall, I tried to make it a low-stress experience and something *I* could really live with. At the very beginning, I said to myself, if this is a high-maintenance thing, or if I'm eating food that tastes like water or straw (broiled fish! steamed broccoli!), I'm not going to be able to do it. I knew I couldn't drag myself to meetings, or be organzied enough to track calories, keep a journal, or go out and shop for pre-packaged diet food. So I just kind've figured out what I COULD do and did that.
9. I ate three meals a day. Sounds like a cliche, but it worked. If I had a definate breakfast, lunch, and dinner, I was less likely to graze.
10. The after-dinner munchies were inevitable, so I figured out low-calories things to eat. My favorites: two apples, skinned and sliced up, sprinkled with cinammon, covered in Saran Wrap and microwaved for 2 minutes. Yum! Just like apple pie filling! Sliced up red peppers used to eat salsa. Also, I've probably eaten a thousand Weight Watchers chocolate mousse popsicles (but just one a night!).
Good luck, you can do it - just find your own way!