I flew into Sudbury, Ontario one fine March day in Toronto. Taxiing in, I noticed that every airplane parked outside in the snow had an engine blanket and an extension cord running to an outlet
Came back a couple days later and applied preheat for half an hour -20C.
Remember you're using low density air to warm high density metal.
After my first abortive attempt, the mechanic worked the prime and the apprentice pulled the prop through exactly as described by PilotDAR.
The people I rent from keep their a/c in the hangar and put on engine blankets immediately after shutdown.