This will be my first Christmas in decades not cooking Christmas dinner as I'll be in Dubai for Christmas day on my way to Australia so it will be something completely different for me.
I go all out with the Christmas dinner but I'm not adverse to having a few "cheats" as it's been my Christmas too.
These are a few tips that I've found useful.
Prepare as much the day before preferably two days before so you're not tired after Christmas Eve.
I made bread stuffing also sausagemeat stuffing a couple of days in advance, both freeze well.
My lot love honey or maple roasted root veg, Tesco's frozen red cabbage and apple, I used to make my own but this is very good and I'm just back from Tesco after buying a bag of it for later. I usually do three types of potatoes - roast, garlic and mashed potatoes. I like brussel sprouts and parboil them then roast them with a drizzle of balsamic vinegar. There's lots of different recipes for them but only cook them if you or your guests like them.
Parboil veg the day before and use foil trays and store in the fridge so they're ready to go straight in the oven on the day. If you have a cool box you could put the trays of prepared food in it and keep outdoors or in a shed to free up fridge space.
A food thermometer is desirable for the turkey. A crown is ideal for the number of guests you're having, cover it until it's nearly cooked and baste often, a thermometer will let you know when it's done so you avoid overcooking it. I normally cook a whole turkey and brine it using Nigella's recipe so the turkey has never been dry and brined cooks quicker. Tesco usually have the cooking times on the front of the packaging. Safefood usually have cooking times but if I followed their cooking times it would be very dry and overdone.
I do pigs in blankets and buy them in Tesco or Lidl. I had to cook Christmas dinner for DS1 and his friends when they were isolating in a different house when they had covid a couple of years ago and one was vegetarian so I got him one of the Lidl Deluxe vegetarian meals and he was delighted with that. They have a large range of vegetarian dishes at Christmas.
I sometimes serve starters about an hour before the main meal depending on what I'm serving as it's easier to just concentrate on getting everything for the main course on serving plates without having everyone sitting at the table waiting.
I make sure to set and decorate the table the night before. It has made a big difference to how smoothly things go on Christmas day.