I loved coming across this glimpse of Nabokov as a teacher, by Barbara D'Amato, on a blog called The Outfit:

In grade school, high school, even college, I read fiction without much—or maybe any—sense of the structure that supported it. Even when I was lucky enough to take a course with Vladimir Nabokov, who led us to focus on details, rather than just coast along enjoying the events, I don’t think I had any sense of structure. That didn’t come until I started trying to write.