Things that worked for us:
Buying the Waitrose cook in a bag turkey. Tis genius! Cooks a turkey big enough for 8 people in 1hour 40mins (it's moist, yummy, only downside you don't get crispy skin, but I don't care about that). This means you can actually serve at 1pm without having to get up at the crack of dawn. (meat in oven just after 10, out just before 12, rested for half an hour then carved giving enough time to sort eveything else for the meal, easy!)
Buying fewer things and no 'tat' for the stocking. (although love the dedicated stocking tat that comes out yearly for just the christmas season, genius!)
Letting DS pick what we had for dinner on Christmas eve after the children's service at Church, chips and burgers was an inspired choice! (And going to church on Christmas eve, not Christmas Day makes it a lot easier)
Coffee machine filled and ready to go on christmas eve evening, so just hit 'on' first thing.
All gifts ordered/bought by start of second week in December. All wrapping done by 22nd.
Culled card list significantly. Told DH to get his own parents and family's gifts (made an exception for DN's gift, but that was rather DSIL told me what DN would like and I added it to an Amazon order I was doing anyway).