To keep the merriment high and tensions low, we turned to the experts for their favorite holiday hairstyles you can easily do in the comfort of your own home—or wherever your holidays take you. Here are some low-effort, high-impact looks celebrity hairstylists are loving this season.  Flat-ironing skills are key here. O’Connor suggests using a hair-smoothing spray that doubles as a heat protectant, like Matrix’s Total Results Mega Sleek Iron Smoother Leave-In Spray, to ensure heat protection as well as very shiny tresses. Make sure your part is perfectly centered to really elevate the look. You can also tuck front pieces behind the ears and cover the area with hair to make it feel more put-together.