Nowadays I start to think about it 3 weeks before, or sometimes less.
I book an online shop for my xmas groceries, And I dont buy many presents anymore, just our close family, Dont write as many cards as I used to and only put up a 3rd of the decorations that I used to.
Running round buying gifts and sourcing the xmas food is a thing of the past for me these days. At most, its 2 days, then all the shops are open again, some of them are open for sales on Boxing day!,
My suggestion is ;- Chillax, and take it as it comes, But not Yet!!