One thing I've found is a good door opener for discussion is..."What do you think about it? Is there something you wish you'd done differently? What is your goal for your next project?" These questions got me into some very constructive teacher/student conferences. I would then let them ask me questions so I could help them clear up any lingering doubts or worries. I remember when my mom was trying to teach me to crochet (I finally did get it with her help) she would say what I lacked in skill I made up for in enthusiasm. I was excited about the process and thrilled that she took the time to teach me (I think I was 8 or 9 at the time).