only one guy. help for a second

So I've only done sexual stuff with one guy who I was with for over a year. I'm about to meet up with a guy friend who I have a flirty connection with. How do I make sure I'm not shy or nervous and I don't hold off or mess up. 
*** Seriously considering a few shots of vodka before I meet him cos you can't smell vodka on you 😂😂😂🙌🏻