Grasp the scythe handle with your dominant hand. Hold onto the shaft with your non-dominant hand. The shaft is called a snath.
Stand with your legs spread about a shoulder's width apart. Swing the scythe back as you twist your torso and propel your body in a forward circular motion. Transfer your weight from your back foot to the front one as you move in the forward circular motion. Allow the blade to just clear the ground along the ditch.
Work along the sides of the ditch in rows. Start from the top and work your way down. Maintain the circular motion as you work in the rows. The result will be rows of cuttings alongside the cut areas.
Rake up the cuttings with a yard rake and bring them to a compost area or place them in the desired area for trash removal.