Prepare the bed. Thoroughly weed and clean the garden bed. The edge between the bed and your yard should be clearly delineated. If it isn't, use a small tiller and shovel to remove the grass or sod from the edge of the garden.
Measure the edge. Using the tape measure, determine the length of your garden bed, in inches.
Purchase your bricks. Purchase enough bricks, with a few feet of extra, to edge the garden. Take note of the height of the brick.
Finish the edge. Using the trowel, create a trench as deep and wide as the bricks. Gently pack the soil to ensure the edge is smooth and will hold the bricks flush.
Protect the trench. To keep out weeds and grass, lay landscaping fabric along the edge trench. Ensure the fabric extends up both sides of the trench and don't worry about excess overlapping the sides. Secure with a thin layer of gravel.
Lay the bricks. Place the bricks in the trench, end to end, until it is completely edged. The top of the bricks should be no more than one inch above the grass. This will require a bit of trial and error as you correct the height to ensure the bricks are level.
Backfill with gravel and cut excess landscaping fabric. Fill any gaps between the bricks and the edge with gravel and use a sharp knife to cut the excess fabric as close to the ground as possible.