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. 

In the Christmas days of yore, people braved winter weather to staple or tack their Christmas lights onto their rooftops or nearby surfaces like the fascia boards. Problems quickly emerged with that approach. Damage to the roof, even small marks from staples, provides entryways for moisture and similar issues that can hasten roof rot, wear, and associated leaks. Plus, some homes had tough fiber cement boards or other materials where staples and screws didn’t work.

Using a staple gun to hang Christmas lights on your roof or shingles is not recommended. Puncturing your roof with staples can cause damage, leading to cracks, leaks, and exposure to the elements. Staples are also less reliable than other methods like roof clips. For a safer alternative that won't damage your roof, use shingle tabs.

The cost to have your house decorated for Christmas depends on the extent of your holiday vision. Interior decorators charge between $50 and $150 per hour on average, so if your decorations are minimal, you could pay as little as $200 for a couple of hours of decorating. Interior decorators might also bill $5 to $12 per square foot, or a flat rate of $500 to $1,300 per room. You can also pay to have your Christmas tree professionally decorated for an average of $200 to $600. Contact a local interior decorator for a specific quote.