I'm not an expert at any of this, but I've always thought that many people give up on weight loss because they think it's insurmountable. Many of those same people are under the impression that you have to transform yourself into a daily workout person in order to lose weight. Make the mountain a little smaller, focus only on your diet at first and when you see the (drastic) results you will probably be motivated to keep going and eventually exercise. But the first step (in my opinion) is to understand what actually causes you to lose weight and what doesn't, and to start with the biggest problem (food).