Being prepared for winter means having an emergency blanket, flashlight with extra batteries and a charged cell phone in the trunk in the event you get stuck on the road somewhere. At least you'll be warm and safe until help arrives. Another way to be prepared for winter is having your tires checked, topping off your fluids and replacing your windshield wiper blades.
Do you really need to replace your wiper blades? Well, if you have used them since before summer they are probably pretty worn, and worn wiper blades can damage the glass on your windshield.