Before you start trying your first K-Fed on skis I suggest you can grab a stick or anything the looks a bit like a rail and practise the technique in you shoes. 1st way to do this is by jump on to the rail and use counter rotation to twist the feet on to the rail while you upper body keep pointed towards the "landing".

After you have done a swop using mainly counter rotation a bit of a lock / scissor is also helpful your chest is still pointing towards the landing. Try to keep your arms a little wide it helps with the balance but also you have a good amount of wind up here. Standing like this helps you spin really fast of the rail since you are standing on the rail with a wind up. Notice how I can swing the left arm a long way before I smack my self in the chest with the hand. This way of doing it is great for Super Fed. Try doing this both natural and unnatural and see what works the best for you.