You can safely remove a fuse from a set of Christmas lights by following these steps: First, make sure the power is off and the lights are unplugged. Next, locate the fuse on the plug or on the strand of lights itself. Once you've found the fuse, use a set of needle-nose pliers to carefully pull it out of its slot. It's important to note that you should never attempt to remove the fuse while the lights are still connected to a power source, as this could be dangerous. Finally, replace the fuse with a new one that matches the wattage of the lights.