My experience is probably typical of many guys.
I started with parlours and was so nervous I never even got in the door the first few times!
Then the first 20 or so with indies, I had sweating, dry mouth, wanting a piss/crap etc
It definitely fades as time goes on, the other day I had got ready and was driving to see a reg and I could very well have been going shopping. I didn't even think about the punt until she opened the door. this does have it's down side as the adrenalin is quite addictive I find. Still, it's a good incentive to push the boundaries, onward and upward!