Wear protective gloves to avoid splinters. On a wooden plank about 4ft long, mark the depth that you would like the edging to be buried. Some people like to have the edging protrude above the level of the lawn by a couple of inches, while others prefer to have the top of the edging level with the lawn. The latter choice will make mowing the grass easier as the wheel of the lawnmower can be run on top of the edging.