It's safe to hang Christmas lights from gutters with a few considerations. First, when installing the lights, follow safe ladder-use guidelines and avoid getting onto the roof. Second, for best results and the integrity of your lights, use clips to keep the bulbs away from inside the gutters where they could run into trouble with water or ice. 

The most likely cause of accidentally flashing lights is that a regular bulb has been replaced with a flash bulb by accident. If that’s not the case, you should look for a bulb on the strand that is not quite seated properly and will lose its connection when it’s touched or moved.

Hiring a professional for holiday decorating, especially for hanging lights, is often well worth the investment for several reasons. A key benefit is safety; if you are physically unable to hang lights due to injury, or if your home has multiple stories or other high places that pose a safety hazard, a professional can handle the job securely. They also have the expertise to assess your electrical system to ensure it can handle the load. Hiring a pro is also a great option for homeowners who lack the time or capability to decorate. Professionals can create a stylish, chic, and upscale look that will wow your guests, and they may even save you money on decor. Finally, many holiday lighting experts include maintenance and repairs as part of their rates, ensuring your display looks great throughout the season without any extra effort on your part.

You can attach Christmas lights to your palm tree by securely wrapping the strings around the tree. If you notice the strands slipping, you can also use a staple gun to secure them to the trunk.