Put on safety glasses and gloves for protection before starting the project.
Position the rock on a suitable work surface so it is supported and will not move or roll.
Draw a line on the rock with a piece of chalk. Draw the line where you intend to cut the rock.
Place the edge of the chisel on the chalk. Position the chisel edge so that it lines up with the chalk line.
Tap the handle of the chisel with the hammer to begin forming a small crack. Continue to move the chisel point along the chalk line, tapping the chisel as you go.
Continue moving the chisel point along the chalk line to increase and control the crack that is formed until the rock is cut.