Be entusiastic about the subject. We get so many 1st year apprentices at interview who only turn up because their Mum has made them rty and get a job.
Look clean and neat.
Turn your phone off and don't chew gum
Show a willingness to learn, and do whatever it takes to become a hairdresser.
Be five minutes early for the interview.
Don't be tempted to give a sob story. It is not X factor, and employers DO NOT like people with problems!
Be prepared to talk about hobbies and interests.
Best of luck, and let us know how you get on x