You're thinking about things way too much. I know, it sounds easy to say, but that's what it comes down to. If you think about it so much that you actually have a conversation planned out and rehearsed, the moment things go off course you'll be in even worse shape than if you hadn't prepared at all. Seriously, just stop over-thinking it. Instead, go do something that you're good at - something that makes you feel good about yourself, to keep your mind off things and keep you in good spirits before your date comes up.
Heck, you can even kill some time by jerking off
