There isn’t any way you can “instruct” a 2 year old to ski. You may play with them on snow while they learn to slide on snow with skis. I agree with Kneale’s first paragraph, but I’m surprised he suggests waiting so long before trying real skis and boots.
Both of my children were skiing way before they knew how to ride a two wheel bike or jump rope. They are now 10 and 6. I started them both around age 2. I didn’t make them walk up the hill to slide down. I started off by putting them on the chair with me on the easiest slope we have. I would hold them between my legs and guide them. I did this for two runs each weekend the first season, usually at the end of the day when it was not too nasty out. They were thrilled. Riding the chair was like an amusement park. I hate rear entry boots, but I used the smallest pair from the rental shop and the shortest skis, 80cm. I bought the stuff used from the rental shop for $25. They didn’t realize the stuff wouldn’t get rented it was too small. These skis and boots have started my siblings and friends children skiing since my first child was finished with them.
Look into some of the items for sale by Steve Lathrop,Apple Rise Sports
. He has a line of products specifically for “young-uns”. I liked the pole with the dowels through it. You can pull or push the child across the snow. He advertises in SKI magazine. I have used the edgy-wedgy, the pole, and a harness. I have used ski poles and bamboo poles. To slow the children down, they hold them like handle bars with me on the other end.
My older child pays me back now by towing me to the chair.