Use the garden hose to lay out the location and dimensions of the area were the flagstone will be installed.
Dig 3 to 4 inches down in the designated area to give the flagstone room when placed on top of the pea stone. Cut any large roots with loppers.
Cover the excavated area with filter fabric.
Spread pea stone over the filter fabric and use the rake to make a smooth surface.
Lay the flagstone on top of the pea gravel.
Press the flagstone into the pea gravel and use a rubber mallet to tamp the flagstone without damaging it.
Use sand to fill the spaces in between the different pieces of flagstone.