You like her and you want to sleep with her is the only true motivation in getting the girl. You dont sleep with a girl because your confident, you dont sleep with a girl because you feel good and you feel that you can get her to like you. You sleep with her because you want her and you want to **** her.
That may work for initial motivation on approach, but it's definitely NOT what gets you laid (unless you are a rapist). In the real world she does have to like you too. Seduction is a two-way street. All the desire and chasing in the world will lead nowhere if you are a creepy guy with the wrong mindset.
If you have no faith or confidence in who you are, it ultimately means you don't really like yourself. It would be foolish to expect other people to like such a person, no? This is why your advice is a little misled. You are taking for granted parts of your game that are innate and making assumptions about the challenges we all face. For you the equation of desire=lay works, but I bet it wouldn't pan out so well if you believed that you would never get laid, or rolled up to her all unsure of yourself.
To keep things in perspective here, I actually agree with the spirit of this thread. Belief does not directly translate to success, but it is just as important as desire, will and action. To try to isolate any of these elements as some kind of magic bullet is sheer foolishness.
