You've seen the Instagram videos: There's a girl about to take scissors to her own hair. You gasp because this can only end badly, but then she snips a few times, and just like magic, there are perfect layers. It seems like everyone's been posting them lately. We've even gotten in on the action: Back in March, we posted a video of a woman on Instagram cutting her own face-framing layers. Now, you may be tempted to break out the kitchen scissors and trim your own hair. But please don't.