Just saw this thread again and I have to say, I;m no further forward ....
Progress has been:
We will have DB,DSiL,DF,DM, cat visiting.
I've worked out who''l sleep where.
Bought some pillows . I have enough duvets and towels.
I've decluttered the boxroom.
I think next will be DH/my room
I'm waiting for the Christmas produce to hit the shops and making lists.
DH and I have booked our day off for our Shopping Trip while the DC are at school.
I will organise some menus /meal ideas for the other days (I know what the 24th/25th/26th will be)
I'll start buying in things like drinks (J2O , soft drinks, Appletise) to hide in the garage.
And I can make a Christmas Cake and Pudding (I might even be organised enough to do them early).
Once I've got that underway, I can relax and enjoy Hallowe'en and Guy Fawkes.
Still need to look for Stocking Gifts for the DC.