In general, confidence, bravado, and wit will get you a long way with girls. Most girls aren't walls, at some point they feel comfortable and are receptive to your advances. The crux to the game here though is hipster chicks. Taking into account their ardent feminism, at parties, they are always reserved and walls to initial interaction. How does one approach this type of female?

Edit: I don't mean sexual advances but rather just "opening up" to someone new.