My first romantic trip

I’m 22 years old and in the first real, proper relationship of my life with a wonderful woman. She and I are spending all of Valentine’s week in London for a romantic getaway and I’m kind of nervous.

Some facts about our relationship:

1) We are long distance (soon to change, shes moving here)

2) We haven’t had sex yet

3) I’ve never had sex with a woman before

I’m a raging lesbian and have been since I was a sweaty teenager but geographically there weren’t exactly any willing ladies around to experiment with. I know that my girlfriend also hasn’t has sex with a woman before so while we aren’t strictly speaking virgins (having both been with men before this), we’re both new to this.

I’m wondering if this week might be the start of our sex lives together and I’m frankly bricking it. How do I not lose my cool and stay calm, even though both of us are inexperienced and nervous?