Breaking up large weight loss goals into smaller increments can be a great motivator. If you want to lose 50 pounds then you could break that into easier but smaller goals of a few pounds each. This makes it easy to see the progress you have made. Don't forget to celebrate your mini-goals as you attain them.
Evaluate your progress regularly when working toward your weight loss goals. There are many charts and graphs available on line to help with this. Having a visual of where you started, and how far you have come, can help to keep you motivated. It also helps you to see when and where you hit stumbling blocks along the way.
Dining out presents a challenge for people trying to lose weight. Even with more healthy options available, restaurant portion sizes are still far too large. One incredibly simple way to control what you're eating is to order your dinner, and ask the server to box half of it up when they bring it to the table. You'll be eating half as much food right off the bat, and can bring home the rest for another meal.