You might try scentless antiperspirant vs. deodorant. Just a dab under each pit. Then Splash on a little baby powder with your hands, over the antiperspirant to help keep things dry.
On the trip over, play some calming music, take long slow breathes, smile at everyone elso on the road. Use positive mental imagery about the upcoming session. Think about rainbow unicorns playing in the clouds.
Embrace a little nervousness. Ask yourself why are you feeling nervous? Likely because you care, and want to make a good impression. That’s a good thing, right? If I am not a little bit nervous about a date, then I would be missing the magic about it. Happy anticipation. Enjoy it.
Then knock ever so gently on the door, smile, and enjoy your magic time together.