Maximise your survival chances with location choice.
Comms are everything. Do not attempt the objective this alone.
Have contingency plans and research your area – foundations are key.
Stack up on fuel and ensure you have daylight to build your camp.
Maximise your heat efficiency with reflectors and early stacking.
Have designated places for gear storage so it can be found in any situation and conditions.
Do what you must to keep warm: Rubbing snow, drinking and smoking to heat up are myths.
That said; do the penguin, put your hands in your armpits or groin and violently hugging yourself with exaggerated movements all work.
If there’s two of you – skin contact of toes into each others armpits is far more effective than it sounds.
Do not go gentle into that good night.