I Used to be Nervous
This is one time of the year (the other is after Christmas) when parents start calling to ask about violin or viola lessons for their kids. For the past year and a half I've been in the nice position of having enough students that I can be more selective about which new students I take.
There's no "audition". I can teach anyone to play the violin well. What I can't do is teach someone to love the violin, nor do the practicing for a student. So I look for that when a student comes for a trial lesson.
I used to be nervous about first lessons, until I realized that the student is already nervous about seeing a new teacher (often their first private violin/viola teacher ever). Now I just have fun and try to put a new student (and parent) at ease. Also, I am by nature a complete goofball when I'm teaching, and that helps. :-) Plus, how can you be nervous when you're talking about bouncy knees?
This Summer and Fall will be exciting because I'm going to have a crop of viola students, all girls. And they will be good. And local youth symphonies will be very happy. So will my only viola student, since she will suddenly have a little gaggle (herd?) of violists to play with in our next recital.
Oh yeah, the first recital! This past Sunday. I was nervous about that too! But of course it was fine, and everyone did a nice job, and everyone laughed and had fun. Next year we will do a recital and a ViOlympics. Kids are already talking about violin 4 hands and figuring out whether they can play the violin while hanging upside down. Heh.

