So how hard is 70-270?

I understand that "how hard is this exam." is relative and depends on many factors, but I just want a general idea. I don't see a lot of posts that are titled "I failed.", but a few here and there. This will be my first Microsoft exam so I'm unfamiliar with the test format, possible points, and such. What's the score needed to pass on this one?

I'm using the Sybex book.