Reading Book 4 of Harry Potter

So I know I'm a little late in the game, but I have just begun reading the Harry Potter books.  I have seen the movies (up until the last one that is in theaters) and have always been a fan, but never got around to reading the books.  As you know, if you've read my other blogs, I am a super duper Twilight fan.  I started out in the wrong order with the Twilight series, reading the first book after the second, but I finished strong.  And have since then read and reread each book several times.  But the Potter series is something that I have liked for years, watching little Harry, Ron, and Hermonie grow up.  I am on the 4th book and I have NO IDEA how it ends, so anyone who reads this, please do not spoil it for me.  I think that is why I blew through the Twilight series in 2 weeks is because I didn't want anyone to spoil the ending.  So, please be patient with me as I attempt to get through the last 3 books without anyone ruining the ending.  I will post updates.