Choose the blank wall you want to hang your frame cluster on.
Lay out the frames how you want them on the wall.
Measure from the top frame down to see if it will fit in the selected space.
Measure your wall space and rearrange the frame layout as necessary, prior to putting nails in. This took me a few tries to get positioned correctly.
Use your handy iPhone level to make sure your frames aren't crooked.
Use the picture wire to hang complicated frames more easily.
You'll want to use vinyl pads on the bottom corners to keep the frames from slipping.
Voila! Your very own, Pottery Barn-looking frame cluster! (it isn't crooked, my camera is, promise.)