Agree with Mr V - pick a WG that has been reviewed positively here and make sure she know you are a 1st timer may help with her taking it easy and relaxed.
Don't do what I did for my first ever punt and have a 3some with 2 English WG in Euston.
I lasted 10 mins - most expensive £250 x 10 mins punt I have had - Big mistake on my part.
Wish I had knowledge about UKP when I started - Unfortunately I found out about UKP middle of last year after having several bad punts.
Been learning ever since