In my opinion, the class was pretty easy. All that it requires is that you know what you're doing and the material - he can honestly make this class much harder, but he doesn't. You also have to make sure you review your notes and stuff, since what he does somewhat stress is the lecture is what in the midterms and final. If you want to do well, just make sure you practice by doing extra problems in the book. If you do it over a routine, it seriously doesn't take that much time. And, even though it may seem like a hassle or chore at first, it really does help. Also, if you need help with anything, go to office hours - I went to my TA's office hours only. I heard that Weinstein can seem a bit demeaning if you go to him, but regardless I never felt the need to go to his OH since my TA was pretty good. This class isn't that hard as long as you understand the material and practice.