[Nancy.]

Yes, prepare everything the day before because it'll save you the stress.
Stuff like peeling and chopping the veg, making pigs in blankets, stuffing (If home-made).
All I do on Christmas morning is bung Turkey (and other meat) in the oven then part steam veg for roasting such as potatoes, parsnips, Carrots.
Make Yorkshire pudding batter (Again, if home-made), bread or brandy sauce (if I forget to buy) and gravy etc. Cooking the veg and waiting for the turkey is the easy part.