My motto is: You have no idea how easy it is to play the organ! From here I run workshops in free improvisation for all age groups. And to improvise is a lot less frightening when you do it together.
A method I use a lot is to let two or more students play the instrument together. It can be a good way to focus on possible ways to build up the music.
I am also teaching individually through my professor position at the University of Stavanger.