Absolutely!

As I said, I have a lot of animals running around my house. It is far easier for me to get an overview from a book. But once I have done that, learned the concepts, seen examples, etc, the final arbitrator is always going to be what is locally installed.

Why?

Well suppose that, like me, you run Perl 5.005_03. Suppose you buy Camel 3 so you can learn to use it. Well then here is a list of features that you will be led to believe that you can use which, in fact, you can't!

Like you I buy books and learn from them. However when I need the answer to be right, I won't rely on books.