Only was nervous the first time and then after that, I just walk like I belong there.
If I call for a room number, I call from my car before I leave it to enter the building.
If a maid is out in the hall, I keep walking to the stairwell to make another pass in a few minutes.
I stopped pounding on the door saying loudly, "I'm here for your incall." That didn't seem like a good idea after awhile.