Key #1 is "right thinking." That doesn't mean you can "think yourself thin," but you need to become aware of your faulty thinking and then challenge it in order to change your weight.
Challenge Your Faulty Thinking
Use these four questions as a yardstick in gauging whether your internal dialogue is rational and productive. They can help pave the way to positive and empowering thoughts in your own life.
For more on restructuring your thinking, go to Chapter 4 in The Ultimate Weight Solution: The 7 Keys to Weight Loss Freedom.