That's great, I'm glad to hear it! I'm not sure about what to suggest for pumping yourself up mentally. Maybe you should take things a little slowly at first? If you don't want to or just in case, it might be a good idea to masturbate a few hours before (say at lunchtime or in the morning if you're meeting her in the evening) if you are worried about the excitement making you cum early. Sorry if that's not a concern for you, but I've found it helps!