Just make it easier to eat less and exercise more. Make sure you have healthy food around so you choose it rather than the unhealthy choices, drink plenty of water (particularly when you feel a little hungry). An activity monitor/watch can help you understand how many calories you're using as you go about your day and how many if you walk or exercise a bit. Try doing exercise before a meal, start with any amount - using something like Strava/Runkeeper to track your progress (however slight) might help if your that kind of person.
