Spray a perimeter around the bed where you plant to install the edgers with landscaping spray paint. The perimeter be the width of the edgers that you plan to use.
Dig a trench in the area between the edge of the garden bed and the painted perimeter using a shovel. Shovel down to a depth so that approximately 1 to 2 inches of the edger will be left exposed. Place the dirt on the outside edge of the dug-out trench.
Lay the edgers down into the trench end to end around the perimeter of the bed. Place a level on top of each edger after you set it into place. Adjust the edgers for level by tapping them with a rubber mallet.
Fill in around the edgers with the dirt removed from the trench. Tamp the dirt down by striking it with a tamper in an even up and down motion.
Rake over the tamped soil with a garden rake to smooth out the surface.