Define your preferred border along your lawn line. Use a garden spade to mark the location where you'll install your rocks. Incorporate a few curves in your rock-edge design to provide a more natural, flowing appearance.
Remove grass and sod from an area about 6 to 8 inches deep along your border. Push the spade edge under the sod or grass to remove most of the greenery while leaving most of the soil intact.
Lay a 3-inch strip of newspapers or mulch along the border. This will allow you to fight weed development without using chemicals.
Place your rocks atop the newspaper or mulch underlayment. Vary their shapes and sizes to present a natural look. Leave 3-inch to 4-inch gaps about every 5 feet to allow creeping plantings to fill in the spaces.
Water the rock-edge landscaping well when you've finished laying rocks. This will allow the rocks to settle into place.