I agree with Fuzzy. Setting a timer is the best way if you're in that pnd fog. (Been there.) Set it for just 5 minutes to get rid of the big ugly clutter - coats, muddy shoes, newspapers, overflowing bins etc. Then set it for another 5 mins to clear the main surface the eye rests on in a room - kitchen table, sofa, floor, whatever it is.
Spend just ten minutes in each room doing this. If you find you stood in a daze, you get jolted by the timer buzzing and you've only lost 5 mins, not half a day!
Don't tidy by sorting. They are two different jobs. So stack all the post neatly for now or put all the toys into a basket. then when you have time or motivation do a 5 minute sort of one thing only - post or dirty laundry.
For Christmas concentrate on making kitchen and living spaces really welcoming. Again, just 5 mins on plumping up cushions, sorting out lighting and decorations, getting rid of ugly broken stuff. Polish mirrors and taps in bathroom and make sure the loo is clean. In bedrooms make the beds and chuck dirty washing in the laundry. Leave it at that.
Have a break for at least 15 mins every hour, with a cup of tea, or playing with kids or doing the little flourishes you enjoy, like flowers, candles if they appeal to you. If they don't - another coffee.
The trick with Flylady stuff is that you do just one job and for a set time. So you set a timer for 10 mins then take your bin bag and empty every bin in the house into it. Tie up the bag when the timer goes and then stick it in the dustbin outside. She says ditch the guilt about recycling for now, just get rid.
Or do 10 mins hoovering the crumbiest bits of floor people can see. Or 10 mins running round the house getting the cobwebs off the ceilings. It's much easier when you have a single, short and easy job rather than trying to tackle the whole house. I used to hate house work and now I don't really think about it much.