And, even if you maintain control of your car, not everyone else will. So, don't ever get lulled into a false sense of security. So, accelerate slowly and gently, turn slowly and gently, and brake slowly and gently. To do this, you have to anticipate turns and stops. That means, going slowly, and leaving plenty of distance between you and other cars.
Rapid movements are what leads 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 EMT's. The more comfortable you are maintaining control and regaining control, the better a winter driver you'll be.