My tips would be:
1. Make slow deliberate steering actions, turn the whell in a smooth manner. Sharp rapid directional change = loss of traction before hitting object.
2. Also ABS or not i firmly bleieve in engine braking, you can come to a complete stand-still without even touching your brakes if your travelling at a reasonable speed. It also helps you to understand your gear ratios. So with correct change downs on approach to corner, while letting the clutch out slowly, and some light braking you can be a lot more in control of your vehicle.
3. Don't drive like a tool, you'll hate yourself when you crash.
4. Use 1 gear higher than you normally would do in good conditions. So if you normally steer a corner/roundabout in 2nd, make sure your in third. This means your revs are lower and a blip of the throttle won't cause catostrophic reaction like chronic understeer.
5. Also, make sure you test your brakes before you need to call on them, ice can develope on the disc itself and until thats gone, your brakes are ineffective.
The biggest thing though is common sense and logic, be safe