My teacher does that, when I was learning the Grieg sonata, especially the first movement, there are very strectchy hand movements throughout the entire piece that take long hours to perfect.. I tried and failed the first time, then she said that it is an easy technique and played it making it seem like nothing. Once you have the image that the technique is soooo easssyyyy, I think it'll come faster, you'll be encouraged...On the other hand, when ppl say that piece is sooo haaard, it discourages the person who wants to try it and they get all nervous when playing it. So ya, saying it's easy and putting a better picture in the studen'ts head would be better, not that I'm a teacher, but I know that's what my teacher does.