After painting/sanding, the final steps of hanging the hexagons and mirrors went pretty quickly -- thanks entirely to the NAIL GUN.

Depending on your wall material, you'll have to sort out the best method for hanging the hexagons. But, for me, the nail gun was my everything. I used finishing nails that were 1"-1.5" longer than the depth of the MDF (switching nail lengths for the two thicknesses of MDF) and it resulted in what seems like a nicely secure application on the wall.

Some enterprising types might wish to affix the hexagon groups together and then hang them as single pieces; but my experiments with that approach did not result in what I felt were secure bonds between the hexagons, so I went with the individual approach.

As I hung each hexagon, I'd affix the accompanying mirror (using the foam tape squares included with the mirrors). As I noted earlier, the hexagons are not perfect so it takes a little manual adjustment and spacing while you're hanging the mirrors. Unless you have immense patience and/or OCD, you shouldn't be going for perfect alignment here -- but aligning each MDF/mirror pair as you hang will help you get close.

That's it. Project done. I've probably written far too many words on this matter now. But, for anyone interested, I hope that it's been helpful.

Happy hexagoning!