You don't need to depend on (or pay) a general contractor to manage your construction project. Whether you're building a new home or renovating an existing one, you can manage the job yourself. Carl Heldmann outlines how to purchase your own land, set a reasonable budget and schedule, describe your needs and vision to an architect, and hire subcontractors to do the actual building. Cut out the middleman and save as much as 25 percent on your beautiful...