In part two, I felt they did a good job of not going through a "previously on Harry Potter" montage because I'm almost certain everyone watching the movie saw the last one, unless there are the book readers who want to see the last movie ever. So the movie takes place from what I guess is Hogwarts being taken over by evil or something along the lines of that. I didn't really understand, but I never read or saw anything past the first movie. So Harry must kill Voldemort in a series of timed events otherwise Voldemort will kill him.
In a n00b's opinion of the film, I didn't understand parts of the movie, so I found it quite boring. Don't get me wrong, it's action packed, but I just couldn't find myself to enjoy it had I seen the other movies. But to the book readers, because you get the full 2 hours, you get a better representation of the book. So if you haven't already seen the movie, go check it out.