I have the same problem which is what makes my diets always fail! And then start up again a couple of months later. Seeing as trying it all in one go doesn't work I do little steps at a time. It's been 3 weeks since I started this diet, in that time I haven't touched a packet of crisps, haven't eaten after 8 and always have breakfast! Plus exercise is every weekday (weekends I go off the rails slightly). I sometimes catch the train to school, which means I end up having to walk 20-25 minutes in the morning. These are little things but they now fit in easily without being too much hassle as it would be if I introduced it all at once.
Also a journal is a good idea, that is what I do for food as well as exercise! I end up not stuffing myself becuase I think, wait I want to look at my journal at the end of today and be proud of it! Not think, ugh you fat greedy cow.
I also have pictures of celebs with flat stomachs on my mirror so every day I see that and think, right today will be a good day! You could try sticking pictures of you that you hate or think you look fat in on your cupboards to stop you from snacking.