C.S.
As a mother of 6, I can tell you, they will find a way to cut their hair! I was so upset when my oldest did it for the first time. It doesn't matter where you put the scissors, they will find them, be it at school, church, a friend's house, wherever... Don't worry, it's just hair, and it will grow back. In the meantime, take some pictures and you will laugh about it someday. My daughter cut ALL of her bangs completely off... she looked pretty silly for the first 6 months of kindergarten.
Good luck!