We have our Christmas dinner later in the day (somewhere between 4 and 5 pm usually) and it’s great - no worries about strict timelines and timings as it really doesn’t matter, it’s ready when it’s ready. Also means you don’t need to get the turkey in the oven first thing which means you can have a leisurely morning enjoying the day instead of stressing. We always have a special breakfast/brunch on the day.
It’s really not a big deal - as others have said, it’s a roast with a few extra sides, that’s all. Most important thing is not to put yourself under too much pressure to make it perfect.
The most important piece of equipment you’ll need, if you don’t already have one, is your meat thermometer - as long as you have that, you can know with certainty that your turkey will come out fantastic without any worries about potential under or over-cooking. Remember it will be much improved for resting for at least one hour, preferably a bit more, so once your turkey is done you can then focus on potatoes and sides without any stress.
We do one roasted vegetable side (something like carrots and parsnips with a lemon, honey and thyme glaze), one pre-made vegetable side (ours is always braised spiced red cabbage as it lends itself very well to being made in advance and frozen, then we just microwave it on the day), and one hob-cooked vegetable side (some variation of sprouts, first steamed then fried/sautéed with bacon & chestnuts or whatever the case may be). Then also pigs in blankets and a tray of stuffing. That’s all easily doable in the hour or so that your turkey is resting.
We make the gravy last, after the turkey has rested for a good, long while.
We always do a ham on the 23rd or 24th. It’s nice to have it ready for Christmas Day so that in the event of any drastic delays/absolute disasters, there’s something festive to be had. However you could also pop it in the slow cooker overnight so it’s ready on Christmas morning.
We don’t do starter(s). Instead, we serve canapés and bubbly earlier in the afternoon so that no one gets hungry whilst waiting for dinner. Mince pies and biscuits/chocolates are set out and tea/coffee. We have a huge dinner, so no pudding is necessary straight after dinner. Later in the evening if anyone’s peckish we serve Christmas cake, cheeses, charcuterie and accompaniments. As well as a turkey sandwich for anyone who fancies it.