The four people that have done it with me with the current pieces so far have played:
Corant - all 4
Impromptu - 1
Vals - 3
Feelin' Good - all 4
I generally play all nine pieces in the book to them and they choose two pieces from each list to try for a few weeks. We then decide which are the best three and then perfect them.
What are you thinking of doing then?