There are these things which I did and its working out.
Because I'd been overweight from my childhood, I used to always feel very embarassed when people talk about it and try to hide when they talk about weight and diet etc.
When I decided I'm going to do this diet, I started telling people how much I weigh now and what weight I would be when I finish my diet. It helped me to commit thinking that people would think I do not have will power. I told my friends about me doing this diet and whenever I talk to them they ask about it and I feel proud to say that I'm still on it. I am also writing a blog which is another comitment. I have stuck a paper which says I want to lose around 5Stones at my house.
I have also told my DH not to allow me to break this diet. So when I get tempted and going to fall off the waggon I ask my husband whether I can break my diet. Ususally its human tendency to seek for some support when you want to do something which you really don't want to do. So when my DH says NO to breaking diet, because I don't get the support I just stick to it.
All these things worked very well for me. Once you get out of that 14 days barrier things are going to be very easy...So All the best. When a person like me can do it, you can definitely continue the diet because I've never stuck on any diet earlier.