Note down why you want to loose the weight. And how much you want to loose, and keep this somewhere you'll see it daily. For example in the kitchen.
Also take a picture of yourself now and keep it again somewhere you can see it daily.
Never ever doubt yourself or your plan, you can do it. Try to include one free meal a week, where you can, within reason, give into cravings or eat anything you want to. But limit what it is and how much, this way you'll work towards this treat each week and each time you have it, you'll feel bad for eating it thus motivating you to keep going! Also you can try getting rid of everything high-calorie from your house, and don't have a secret stash of chocolate or sweets or anything, this will only annoy you!
But the best tool is self confidence and self motivation. Having a reason for doing it, trust me, can mean all the difference. Just doing it for the heck of it isn't good enough, because you'll soon trip up and stop. I guarantee it. So get writing down your goals and reasons and keep them visible.
Also keep yourself busy with something, if you're sitting around bored or watching TV chances are you're going to want to eat something. So do something to keep yourself busy.
Good luck!