Measure from the center of the ceiling to the area where you want the swag to drape to. Most swags begin in the middle of the room and end in a corner. Measure this distance and add about 2 feet for draping.
Cut the fabric to the appropriate length.
Place the ladder in the center of the room and ascend it with your fabric and staple gun.
Staple one end of the fabric to the ceiling. Organza and tulle are lightweight, so one staple will hold the fabric in place, but you can add extra if you want extra stability.
Move the ladder to the corner or end point of the swag.
Gather the loose fabric and ascend the ladder with the staple gun. Staple the end of the fabric in place. You will now have a soft swag draping from the center of the room outward. Add more, if desired, using the same method.