Should there be understeer, then apply the brake gently and bring the car back on line and feed the power. In case of oversteer, on the other hand, use opposite lock and feed the power and you will have the car sideways back in control.
The one thing that stood me in good stead was my smooth driving style and my lines round the corners. You have to be extremely smooth as you can imagine that the driving surface is like an ice skating rink and even walking on this surface is a challenge. First you start to get the car sideways, then you start stringing two, then three corners and then the whole lap and you feel like a king and get overconfident, then you start pushing harder and, all of a sudden, you find yourself in the snow-bank looking like an idiot! It teaches you not to get carried away by the grip level of the surface. There was a lesson to be learnt: don’t get carried away as you are brought down to earth in a second. Driving the car on ice is hard work; so much so that within three to four laps you start sweating even in that extremely cold weather.