Just take is slooooow. You've got something that most people wish for and never get. Don't lose it. Just start by kissing her on the cheek or the neck when you hug her.
If it's any consolation, my best friend made the first move on me (yes, I'm in your little lucky club

), she was my first kiss (first everything else really too), and I was bricking it. It was fine.
The only time I've been REALLY scared was when we started taking it further. I was embarassed I'd do something she didn't like or whatever, but we took it slow, about 6 months of fooling around before we went all the way, and it was fine. Obviously my first time my hands were shaking like a bitch, but yeah.
Talk to her about it maybe? I find that works with alot of things
