Count your calories daily and keep them recorded. Watch the nutritional information on all of the foods that you eat.
Eat high calorie foods in moderation. Just because you have enough calories to eat them doesn't mean that they are the best foods for you to eat.
Track your burned calories as closely as possible you you can see how many calories you are burning.
Try and weigh daily, though it may fluctuate up and down on a day to day basis, or weigh once a week.