After first impressions you may not easily tell apart someone who is self confident from someoneelse who is just enamoured of herself.
The self confident is someone who knows what she wants and believes in her intelligence and intuition. Yet she has all her antennae very well extended and receptive to inputs that would eventually shatter some of her assumptions, and consequently rearranges her amended view of the world.
The self infatuated is pretty set up. For her there are two kind of people: those who see things the right way and share her views, and those who are too lost to see the truth and are thus unpredictable, dangerous and better kept in close check.