Write up a list of ALL of the reasons you want to loose weight. (doesn't matter how petty or small some of theses easons may be). And also a list of all the things that are going to be different when you do loose weight that you are looking forward to. (ie, fitting a certain size clothing, being able to climb under the cot, not having to take certain medication, etc). Keep both these list somewhere hat you can see regularly, and when you are tempted to 'give up' (or you already have temporarily) pull these list out and read them and remind youself. Also if you have a 'skinny' photo of yourself that is a good thing to put in your temptation zone (ie, fridge door) to remind your self of what you want to do and how you wish to look.

Will power will only get you so far, there WILL be times you crack and are ready to chuck it in - so put strategies in place for those times. Don't keep tempting foods in the house. Be organised and plan as much as you can to support a healthier lifestyle. Delay gratification - don't tell yourself you cann't have things, but tell yourself you can have things if you really want them, but you need to wait so long, or do something first. Figure out what YOUR biggest obstacles are and come up with possible solutions BEFORE the situation even arises, and you will be in a much better position then you would otherwise.