Good luck with the testing Jenn. You will do fine. It's not much more than you would have when you go in for your annual pelvic with your GYN. At least, that's how I felt.
Be up front with the tech/urologist about all your symptoms, that's the best way for them to know what's going on and how to treat you. If they don't know what your symptoms are or have been, they are in the dark as what to expect as well. Remember, they are only as good as the knowledge they have about you!
Take care.