Where's the big split?

[ilovedanradcliffe]

I am reading Harry Potter and the Deathly Hallows and I want to read the book before I see the movies. So, I was wondering where they split part one and part two. That way, after I finish reading that certain part in the book where they split, I can go ahead and watch part one instead of watching both parts at once for about 5 hours.
Thanks!
Chloe. (: