It's very easy to get through. He writes in a manner that makes it easy to understand and explains the difficult topics well. I read it for the first time as a teenager when I was obsessed with Hawking and had no trouble comprehending it.
I read it, understood the first half, got a little confused on the third quarter, then gave up. I was much younger though, and I think I only tried to read it because I thought that was a cool thing to do lol.
I have. It took me a while to get through just because I stopped periodically to think about it. The basic gist of it is not too difficult to understand however.
I read the first ten pages in college and then I stopped because I could not get through it. I'm an intelligent person, but physics is of absolutely no interest to me.