When I was 11 I had 4 teeth pulled at once and then another 2 the next year - my baby teeth were slow in coming out and I needed them gone for braces.
It's not that bad when you're a kid. Just make sure that if he's not going to be sedated, he has something to listen to. Whether it is a walkman, i-pod, whatever, make sure he has something to listen to.
Even if you don't want him to use headphones, one time won't hurt.It's good to drown out the sound of his teeth being pulled out, it's not too loud but it's a distinctive sound.
Tell him good luck, and remind him that he's gonna rake it in from the Tooth Fairy!