RE: When does the nevousness stop?
For me, usually after the second flight of the day, after I am comfortable with the way I am responding to the aircraft performance and after I've done about 10 touch and go landings.
In other words, for most of us, it never really goes away. We just get comfortable and fly the plane. There always is a slight nag in the background that tells us that we have to be careful... or else.
CGr