You know how people often talk about a whip and a carrot? The whip being what drives you on when you don't want to, and the carrot motivating the whipping. Well, you need to take the carrot and whip yourself with it.
That analogy aside, motivation is everything. Eat smaller portions. Eat regularly. Sleep normally. Be more active than you usually are. Don't go overboard, it's easy to overdo in the beginning.
Talk to others about your ambition to lose weight and ask for their support in it. It means a lot when the going gets tough!