STEP 1 : Remove the Old Grass and Topsoil
Start by using a sharp spade shovel or rent a sod cutter from your local hardware store to remove the existing grass and soil. Make sure to dig deep enough to get rid of any roots and grass clumps, then level the area as best as you can.
If you have a sprinkler system, you can either pull it out or leave it in place. For a smoother surface, it's a good idea to remove any exposed sprinkler heads. That way, if you or a future homeowner ever want to reinstall natural grass, the system can be easily restored. Dig down about 2 to 4 inches from the original ground level to prepare the base for your new turf.