My girlfriend and I tried to have sex for the first time, and we were both pretty nervous, so it screwed things up. I couldn't really get hard, and she wasn't really lubricated, but for anything else we don't have these problems. We both want to try again soon.
So any tips on how to stay calm?
'The only thing we have to fear, is fear itself'
I would definately take your time. Make-out a bit longer; enjoy eachother. If lubrication is still a problem for her, go to the local drug store and pick up one of the numerous lubrication lotions. If it doesn't happen right away, you will both work into it eventually. The worse thing you can do is get frustrated and try to rush it, which will not be enjoyable for either one of you.