edit: why is this getting voted down? I would expect there are a fair number of people here who took the course with a casual approach, like I did. E.g., I usually watched the lectures early Sunday, then did the homework that night. Then, for those topics that I enjoyed and wanted in more depth, I read the sections in the book on them. This approach is relaxing and fun, but does increase the tendency to make silly mistakes and not catch them (which I in fact have done a few times now).
I am, it turns out, enjoying the material enough that I think I would like, if I ever find myself looking for a job, to find one where I can use this stuff.