The key with chicks is not to pursue them too aggressively. You don't need them, cause you have other options, and even if you don't that's the attitude you have to have. Don't be a jerk, just be confident and don't come across like you have to have her. You have to have a healthy indifference towards them. Take the attitude that you like them and that you'd like to spend time with them, get to know them and if things happen to work out, cool, but if they don't no big deal. In many cases if you do this they'll end up pursuing you and trying to sell themselves to you. Never try to "sell" yourself to a women though. You have to remember that men's and women's pyschology are totatlly different, they do not think like us at all. This is confusing for us guys, we tend to be more logical, they tend to be more emotional and emotions usually aren't all that logical. If you ask questions, get to know them, let them do most of the talking, and meet their emotional needs they'll be happy for the most part. You kind of have to have the attitude that you don't need them, that you may want them, but don't need them. Also have the attitude that if things don't work out with her, that's fine cause you have other options, or at least are confident enough in yourself that you know you could meet someone else.
Girls don't like neediness or desperation or a guy that comes across like he has no other options. Often this is how "nice guys" come across, because being too nice comes across like kissing ass and if someone has to kiss your ass you usually view them as below you. It's a harsh reality, but it is reality.