Make sure you have a timings list and then you're able to work out what needs to go in when, and everything should be ready at the right time.
The turkey can come out and rest for quite a while, gives plenty of tome to free up the oven for everything else.
I try to prep veg the night before (peeling pots, parsnips, prepping sprouts etc), and then leave them in a covered bowl of cold water overnight.
If doing eg cauliflower cheese, I prep the evening before (we usually have a baked ham and mac & cheese the night before, so I'm making the cheese sauce anyway).
I buy prepared chipolatas and often stuffing too.
Pudding usually made by my mum, but I'd make that in advance too if needed.
I find as long as I've got my timings, the last hour before eating is a flurry of activity, but for the rest of the morning, it's fine with the odd bit of popping stuff in the oven here and there. And make sure you delegate!! Don't do all the cooking, and all the washing up, and laying the table, and choosing the wine, and...you get the gist. Make sure everyone is doing something to help.