If you learn things quickly, you'll develop natural game and it won't matter who the girl is.
That's what happened with me. Used to be introverted but over a series of events and just learning/watching others do it right, I developed rock solid confidence and now I know for a fact I can get whoever I want, whenever.
There really is no specific way to pick up girls. If your body language is right and if you're mentally at ease when talking to girls, they will be the ones to make moves on you.
Anyways on topic- I talked with a girl like this, a self-proclaimed FPUA. They are usually the more quiet girls at first, but also the most bitchy/hard to get. The key is all about attention. when I talk to multiple girls I NEVER give any one girl attention. I address them all as a group. If you can play the attention game right, it's not too hard to get with a FPUA
Hell, these kinds of girls are the most fun
couldnt have said it better