Step 10: Embed the edging

Install edging over the sides of the fireplace and surrounding the firebox.
Cover the edge of the tiles with metal edging.
Spread thin-set near the corner and press the edging into the thin-set.
Use a margin trowel to embed the edging and smooth the thin-set.
Step 11: Begin in the middle

I started with the middle tiles to make sure they were perfectly centred, level and plumb.
After setting the lower tiles, I placed 2x2s within the fireplace box to prevent the next rows of tile from sliding downward.
I finished tiling to the top and kept the supports in while the thin-set cured.
Step 12: Make precise marks

Cutting the tile around the fireplace is tricky. If the tiles don’t line up, you’ll notice, so precise cuts are important.
Cut a tile to the proper width and dry-fit it into place.
Mark precisely where it will meet the edges of the adjacent tiles and cut the notch away.