How to talk to a girl who makes me nervous?

I like this girl that's in two of my classes so I have plenty of time to talk to her.But when I get in to the first class,I get nervous.I have talked to her before.So how can I talk to her with out getting nervous?How to talk to a girl who makes me nervous?
just thnk that grl as ur best frnd and i thnk all will b well coz u will thnk her just as ur best frnd and nothing more or else just thnk bout ur future with her and thnk that she has the capability to b ur frnd or ur grl frnd or even ur wife what so ever just think of her , if i had this chance i wouldnt miss it,so plzzzz just try to talk to her and slowly begin ur frndship and from ur side u must show ur interest and than just c her expressions or just w8 and watch and i thnk that it will definately work out coz i have tried it just u need to do is to show interest in her and dont let this chance go out from ur hand so dont let it go away from u coz after chance goes on than theres no other wayHow to talk to a girl who makes me nervous?
you'll just have to get used to her, breathe, and tell yourself that she probably enjoys your company and wants you to talk to her
Just be yourself- smile a lot, be funny, just act confident! If you're nervous, a girl will be able to tell. But you know, she might think it's kinda cute and be flattered. As long as you don't act tooo nervous. But bottom line, just relax! I promise you that she won't bite your head off or anything- she needs to get to know you and like you for who you are
start things slow and just say hi or something sooner or later you'll get up the courage to talk to her more