If you are sliding towards something and not slowing down, get off the brakes and steer!
If you get stuck on a hill in a fwd car, and can't do a 3 point turn as the back of the car slides down the hill during the manoeuvre, as you get sideways, put the car in first and spin the front wheels so they lose grip and slide downhill before the rear wheels. (I found this method after getting stuck on a long steep hill and being faced with a long reverse a couple of years ago) Use it this morning aswell which meant I was able to join the main road in the traditional forward direction, unlike the neighbours who reversed onto the main road on a blind bend.
If you have a 4×4, don't be silly…normal cars will get stuck going up a hill early enough to be able to get down safely. A 4×4 will climb further, but when you turn round you have little more control than the 2wd cars that turned round 1/2 mile back. As soon as you touch the brakes you'll over-ride any benefit of descending in 4×4 under engine braking, (assuming you remember to select 4×4/any diff locks) and be unable to stop or even be able to stop picking up speed.
Finally, clear the snow from your lights! The amount of people I saw this morning with invisible lights 😯