I still suffer from nerves especially on a first appointment. My tips would be,
Haggle, you'll feel far more confident if you know that you have hammered out a good deal.
Practice, have a wank or 2 the night before and again on the morning of the appointment.
Duck into a pub and take a dump before getting to her apartment, nerves have a funny way of making you stink up her bathroom. Not good for romance.
To anyone that doesn't like me here.
I hope you need to pee 3 times tonight, but that you only wake up twice.