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.
My wife caught me wearing ladies underwear and threatened to leave me.
So I packed up all her clothes
And left.