IMHO, too many people needlessly stress themselves over having that perfect holiday, and if it's not absolutely no-mistakes perfect then the holiday is ruined.
Some of my favorite memories are ones of holidays where something went wrong. Example my stepmom made the red jello salad but accidentally spilled it in the fridge, which made it look like a crime scene. We're still laughing over that one.
I just make lists so I don't accidentally forget anyone. Pick out gifts that they might like or one from their wish list. If I get decorations up, that's great. This time is being with family and friends and making that warm fuzzy feeling.