Garage door cable snapped - Can I repair it myself?

In torsion spring systems, cables are attached to the brackets at the bottom of the door. The cables are attached to the drums at the top of the door and when the door is raised, the cables wind onto the drums.
In extension spring systems, the cables are part of the pulley system. 
Cables help both side of your door stay in balance as it moves up and down. It is crucial that cables are running in sync so that other parts do not get damaged. Furthermore, because these parts are under high tension, please have a door professional take care of this repair.