My advice: if you don't understand it at first, read it again. And again. Follow the references and read them if you need to. Or google what you don't understand, read up on it on Wikipedia, or another source. People give up way too easily.

Some of you might remember the invisible wall in your mind between you and college-level (and higher) math/science books/papers that you had before you went to college. Breaking that barrier has been one of the most important things I got from college.

Nothing is too difficult to understand (someone had to understand it to write a book about it), so don't give up too early.