This thread is full of good advice; I will echo what many have said
*Practice – The most important skill in winter driving is no different than off road driving, go out and learn how to drive in it. Many have recommended parking lots or back roads both of which are perfect. I do not recommend going out during rush hour in a blizzard to practice……be smart about it but don’t be scared of the weather. I would say I normally use no more than 15% throttle or brake in snow/icey conditions.
*Winter Kit – Put together a small kit of stuff to keep in the car during the winter, plenty of advice online about what this should contain.
*Fuel – Keep a decent amount of fuel in the tank, I am fairly conservative and generally will fill up any time I get below ½ a tank I like having the safety net
*Warming up the engine – Countless debates on this online, in general I start the car before clearing and then drive conservatively for a while till things warm up (always in bad weather but let’s say it’s a 5 degree sunny day with dry roads I would at least give it 30 seconds to make sure the oil pressure is built (no idea what it actually takes but I would guess no more than10)
*Clear your car off fully – People who drive around without cleared rear or side windows……well nuff said
*Winter tires are your friend – for as conservative as I am it pains me to say that I do not have a set of winter tires for the 4runner. I have yet to make it a priority and make room for the summer set but I will say that KM2’s are likely one of the worst winter tires out there and the Nokian Hakka R2’s are some of the best (on wife’s car). Night and day difference in how easily the tires break loose.
*** A note about Chicago (or anywhere with road construction), Jersey barriers can accumulated snowfall/melted water and turn into a real hazard in heavy rain or during freezing conditions as you all the sudden hit 2-4” of water or a sheet of ice at 55mph. I believe they all have drains but I often see this so I assume that it is either the low spot of the road or the drains are clogged with leaves, debris etc