just wanted to add my two cents....
little hair claw clips work as well...not the teeny ones, the small ones. I start with a wet pony, wrap the hair around into the bun, put the hair net over as many times as it will go and then use the hair claws all the way around, clipping the bun to the hair against the head. If the claws are close to the hair color they disappear. This was the ONLY way I could keep my little adopted cousin's hair in a bun. She's from china and has incredibly thick hair. The hair claw clips were a LIFE SAVER! Some ballet teachers are more strict about what kinds of things can be used for buns, (mine was!) but there was no choice in this case!
you'll be a bun expert in no time!!!