This mirror is incredible, gorgeous, ingeniously easy to hang.  We couldn't love it more.  I call it "the window simulator."

Pro tip for mounting/hanging:
1 - Unscrew the mounting bar from the back of the mirror.
2 - Hold the bar up to the wall with a level and make pencil marks at the top center of each of the 4 D-rings with the bar completely level at the height you'd like to hang it.
3 - Nail in the 4 hanging brackets.  Hang the mounting bar in the 4 brackets.
4 - Put your level on the bar and make sure it is still level.  If it's not, adjust the screws on the relevant brackets to make sure the bar is level and all 4 brackets have good contact with the bar.
5 - Screw the bar back onto the back of the mirror
6 - Hang the mirror with a friend to help.

I seriously enjoyed mounting this thing, it's so well thought out.  And the mirror is a real show piece.  Thanks Wayfair.