Things I can do to improve my pick up performance

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So yesterday at the pool I tried going up to a random girl and started talking to her. She started talking to me at first but I was nervous and messed up. So I dicided that I should fix this. I'm always good at talking to my friends, it's just I've never done that and got nervous. I want to get my confidence up so I'm going to try to do this more often so I get used to it. I'm gonna talk with girls online so I can practice what I'm going to say. I want to work on my humor so I thought I could hang out with my funny friends more, watch some stand up comedy, maybe read a book on it. Anyone got any other ideas?