There's nothing quite like a great haircut. That feeling when you can't stop catching a glimpse of yourself in the mirror or running your hands through your new layers is priceless. Unfortunately, a bad hairstyle can cut through all that confidence and leave you looking older than you are. The good news is that it's pretty easy to update your look without a lot of time or money. We asked some of our favorite hairstylists to share the biggest mistakes they see women making with their hair — and how to fix them!