Installing State Tile Flooring in Laundry Room

Replacing Builder grade tile on the laundry room floor
*Options I considered for this project:
We debated between extending the hardwoods or using tile
*Questions and unexpected events that arose during the project:
How hard it was to remove the existing tile from the floor, and making sure the floor as level before we added the new tile.
*My motivation to do this project:
After purchasing new stainless was her and dryer we wanted to Install for slate on the floor instead of the builder grade tile for a better transition into the kitchen which had hardwood floors.
*Project Steps:
Start with laying the floor tiles centered in the room for the best visual appearance.
Begin laying the tile from the center of the floor where your two final reference lines cross, then use the lines as a guide as you work your way outward toward the walls.
Spread the adhesive with the trowel's notched edge, combing it out in beaded ridges. Spaces between ridges of adhesive should be almost bare.
If you wish, you may insert plastic spacers between the tiles to help maintain straight grout lines. This way you can choose the grout with you want.
After laying all the whole tiles that will fit, begin cutting and adding tiles to fill around the perimeter of the room.
You usually always have to cut some tiles, I prefer to use a wet tile saw. You can rent these at your local hardware store for about $20 a day.
After all the tiles have been put in place, its time to grout and seal the floor. Mix grout to the consistency of a thick paste and apply it by forcing the grout between tiles with a rubber float held at a 45 degree angle. Wipe away excess grout from the surface of the tiles. Take care to pack all joints. Use a toothbrush to shape the grout. After 20 minutes, wipe away all excess grout with a damp sponge. Keep your sponge clean by rinsing it often. After the grout has cured for a week, silicone grout sealer may be applied with a small paintbrush to help prevent grout discoloration.
Advice:
If your removing old tile, make sure you have a place to dump it. It can get very heavy.
Materials:
Slate 12"x12" tiles/ea - $1.15
Spackling compound/4lbs - $8.00
Tile spacers/100 - $3.00
Tile adhesive/3gal - $34.00
Silicone caulk/tube - $7.00
Silicone grout sealer/1gal - $85.00