Delusional self-confidence flat out WORKS with women. It also puts you at odds with society. Like most things in life, it's a trade off. The goal is to strike a balance--at a certain point, narcissism becomes pathological, and will hamper your ability to maintain relationships of all types.
In theory, the natural antagonism between what's good for the individual and what's good for society lies at the core of sexual selection; women overwhelmingly desire the most powerful men that impose THEIR OWN rules on society to father their children. It's the bad boy/ rock star effect --when a man takes center stage and commands attention from the audience, whether figuratively or literally, there is a collective buying temperature spike from the females.
Of course, theory does not always hold up in practice, primarily because this type of narcissistic behavior is BAD for society. So, women will feel attraction for these rebel types while raising their offspring to be " perfect gentlemen"--and that is how the frustration that led to the birth of "game" was born.
This is a roundabout answer, but I find it helpful to understand WHY being a selfish jerk "works," instead of advocating that one emulate this model. There is more to life than pickup, so this kind of behavior should not be taken to extremes--unless you want a life of isolation. In a relationship, this type of behavior can lead to just as much trouble as AFC behavior.
Where delusional inner game DOES have a place is in the "courtship" process--from meeting to sex. This is where ATTRACTION matters above all else, and if you don't believe you're the greatest man who ever lived, she's going to keep holding out for the guy that believes he is.
Now, most of us do NOT possess this type of narcissism, and that means we are psychologically healthy. We CAN tap into this type of belief system for specific purposes, however. A good example is ignoring a s#it test and refusing to qualify yourself--if you are so in love with yourself, you will assume that everyone else sees the same things you do, hence you have nothing to prove. Another example is blowing off rejection and continuing to game--you KNOW that her rejection comes not because she's "better" than you, but simply because she doesn't know you well enough yet. A rational, objective person would NOT necessarily comes to these conclusions had they not studied the female attraction mechanism--this is why logical, intelligent men are RARELY naturals with women. We are often too aware of our own shortcomings and flaws to fully embrace an entirely self-confident view of ourselves.
So, I think the key is not to "trick" yourself into being overconfident (it won't work), but rather, to understand WHY it works and HOW to tap into it in certain situations. The RSD guys do a lot of work in this area--their game is hardly verbal at all and entirely based on the idea of "state"--which is essentially delusional inner game. This works wonders in clubs and with younger, hot women. Of course, without real world success, it's hard to truly get in "state"--it's another catch 22.