Fixing a garage door cable may seem daunting, but it's actually simpler than you'd think. The first step is to release the tension on the cable by opening the garage door fully. Then, you'll need to loosen the cable drum and remove the old cable. After this, you can install the new cable, making sure to thread it correctly through the pulley system. Finally, tighten the cable drum back up, ensuring there's enough tension for the door to operate smoothly.