David Yates did a magnificent job adapting the last book in the HP series into a Movie. For those who didn't know, this was split into 2 movies bc: A) the director wanted to stay as close to possible to the book, which was the longest in the series. B) Having the movie in 2 parts allowed for a much larger budget which allowed the director to really do a great 2 part movie.
DO yourself a favor after you watch.. take a look back at the first film and remind yourself that these characters and this story are truely years in the making and this move is best shown in 2 parts. You'll think..Peter Jackson should have done this with LOTR... would have made it much better!