A lot of winterising post and advice I have seen is targeted at changes to the house - but you also need to get your clothes and shoes ready for winter. Shoes in particular! They need to be warm, comfortable and rain-and-snow-resistant.
Put away your summer shoes (sandals etc) and get out all your sturdier shoes. Check the heels and soles, and get them repaired if necessary. If your shoes are leather, give them a thorough treatment - you can buy products to help keep leather waterproof, but I use my homemade shoe polish as the beeswax does that beautifully. If your shoes don't fit or have holes, now is the time to go out and buy a new pair - you don't want to find yourself without suitable footwear when the snow starts getting slushy. While you're at it, check that you also have warm socks that extend as far up your leg as the boots.
If like me you live in an urban area, you are unlikely to have a pair of wellies or walking boots. While you probably can't wear these at work, I get a lot of use out of my sturdy walking boots for trips to the supermarket, and walking to and from work (I change shoes when I get there.) My feet thank me, I save on damage to my other shoes, and I can walk around more quickly and safely with the better grip.