My first grading (5th Kyu) I was sitting and waiting to be called up. There was an open door behind me and a draft coming in. I got so worried that my feet were going to fall asleep that I got over my worries about my test. When I was called up I didn't fall flat on my face but I did get the wrong line to sit down on. Actually i did that at the start of my 4th Kyu test as well, I took that as a hopeful sign. When you start worrying about the ettiquet of the situation somehow the techniques seem less scary.