You can avoid having your windscreen steam up from the inside if you keep the inside surface as clean as possible. Less moisture condenses on clean glass. If the windscreen does steam up, you can get rid of it quickly and easily by putting the heating on, setting the fan to max, and directing the air onto the windscreen. At the same time, turn on the rear window heating. If your car has front windscreen heating, you should of course turn that on as well.
Before setting out, take off your heavy coat so that it won’t restrict your movements or slow your reactions. In the event of an accident, a bulky coat with a slippery surface can cause a driver or passengers to slip out of the safety belt and harness. The same rule applies to all passengers in the car.