I did exactly that this past season, and the only thing I am mad about is that I didnt do it sooner. Not sure how hard it is to switch...I started off boarding, but the first day I put on a pair of skis it just made sense to me. I could do it, without really knowing what I was doing. My brother also changed over with me and he had a bit tougher time getting used to the change.
If you are a coordinated person though it shouldnt be a problem. the second time we went, his friend who had been skiing for years came and gave us little pointers that helped make things easier. I would say go for it. I only ended up being able to go skiing 4x this season, but already love it so much more than I ever did boarding. Take a day and rent some gear...ride all day, by the end of the day you will be able to make your decision...please to try to have some stranger on NS make it for you. Try for yourself