Should I worry?

Don't worry about or think too much. over analyzing just ruins everything and it could ruin the moment if you want everything to be just right. when you guys start kissing feel her vibe and what she's doing and you'll catch on in a matter of no time.

Dude. Go to a close chick friend you trust and tell her you don't know if you know how to kiss and practice. Most guys can't kiss. Here is a little advice: When you kiss her DO NOT thrust your tongue down her throat. Its gross and annoying. I don't want to be suffocated when I kiss someone. Keep the saliva to a minimum because it too is gross. Take her lead if you aren't comfortable in your kissing ability

While many people would say you need to start preparing for the event by finding someone to practice with, I have found that women who are worth getting to know will appreciate the fact that you are willing to wait and learn with them. The first few kisses may or may not be as enjoyable as any she has ever had but, she will respect the fact you are willing to learn with her, rather than learn from someone else that she will be compared to.