How should I act when I see this girl for the first time in a year?

Alright heres the run down. I met this girl last summer at a camp at Mizzou, she was in my group during the camp so I got to talk to her a lot. When it was over I got her number. Soon, we both started texting eachother frequently, almost everyday. Now a year later, I am planning to take a trip up to see her in a couple of weeks. But here is the kicker, we live almost 4 hours away from eachother. Im incredibly nervous because a lot can change in a one year time. So basically I need tips and suggestion on how I should act when im around her. I like her a lot but I dont want to be cocky. Can you help me out a little?