Do everything slowly and gently. Remember, in the snow, the tires are always just barely grabbing the road. Accelerate slowly and gently, turn slowly and gently and brake slowly and gently. To do this, you have to anticipate turns and stops. Going slowly and leaving plenty of distance between you and other cars.
Rapid movements lead to skids and loss of control.
If you're nervous about driving in winter, consider spending some time practicing. Go to an empty parking lot and try sending the car into a little skid on purpose. Doing this in a large, empty parking lot allows you the luxury of skidding without ending up flat on your back, looking up into the eyes of seven different EMTs. The more comfortable you are maintaining control and regaining control, the better a winter driver you'll be. Oh, and one more thing.