Anytime I'm in a slump, I'll start a random conversation with a girl. Usually starting with something stupid and situational then slowing transferring to questions about herself and stuff like that - so it seems like I'm sort of interested. If we are standing, i'll throw something in the conversation to the likes of, "oh, yeah I'm just getting one more drink before me and my friends head to xyz bar."

Then when it seems to be going really well and seems to be approaching the point where I would ask for her number or to come along with my friends to the next bar I'll say something like, "Okay, well it was nice to meet ya, but I'm done with my drink and its time to me to get to that next bar - see you around." and just take off, which I was planning on doing the entire time.

This accomplishes two things. One, whenever I do this I'll always remember that it was going real well (even if it wasn't - since I didn't get shut down or anything) and it will give me a TON of confidence for that next bar or for that night, or whatever and thus makes it MUCH easier to talk to women since I marked that one up as a success even though I didn't accomplish anything. Two, if you see that girl later that night - more or less automatic.

All the stuff I see on here in the responses about getting over approach anxiety usually says "man up and just do it" but thats the worst advice ever because once you get up there (if you actually man up) the anxiety is ten fold. If your new to it or are struggling at the moment, do as I described above and it really is an instant problem solver.