If you're like me and waiting for your door doorbell to ring, you may want to take a moment to read this post from Stephen Hacket about iPhone X repair costs. In short, they're really expensive.
If you break the front iPhone X screen, out of warranty repair cost is $279. If you break the back, it's a whopping $549 to repair. If you bought your new iPhone X without AppleCare, I'd recommend adding it ... today. You can add AppleCare to a new device within 60 days after purchase.