A Narcissist will think highly of themselves while constantly putting others down. They are their own best cheerleaders, filling up on self righteousness which manifest into fantasy which always turns into delusion.
2. THEY ARE NEVER WRONG
One of the most important thing to the narcissist is that they must "win" at any cost. Being seen as a "loser" is to damaging to them socially. They think in this general term of winning and losing.
No matter what you have going on in your life a narcissist will always have it worse. If you try and talk with a narc. about your problem they will turn it back on themselves as they have no empathy for others.