Everybodies different. So it's hard to give any good advice. Best advice I can give is to listen, (because I used to suck at it). If she's the kind of girl who rushes into things head first without thinking, then you need to be very careful. If she's the suspicious kind you need to show you're reliable etc. She will tell you what she needs in one way or another. All you need to do is to be attentive.

It takes two to dance. You might do everything right and it still doesn't work. You might do everything wrong and she might love you more because of it. I think honesty is good. She's probably as nervous as you are. If the two of you are important to one another and both of you want to build something, then being nervous about it is just healthy.