Don’t "Diet"
Inherently the term dieting lacks a feel of permanence. I mean most people see their diet as temporary until they have lost x number of pounds. However, with that sort of attitude once they have quit "dieting" and returned to their normal diet (the one that got them fat in the first place) they will most likely regain all the weight.
So before you start dieting make the decision to change your lifestyle (once you achieve your ideal weight you won’t have to be as strict). Once you have decided this you will find it easier to make it through since it’s not something you are just suffering through and patiently bearing. It’s how you are going to live.