Honestly, yes you can. You can have all the resources you can within books and the internet which are ready made available. But on the other hand, there will be a slight problem with you studying by yourself. You do not have anyone to ask questions if you needed the simplest way to understand it. No shortcuts because you will have t scan everything by yourself. You would not know if you are still on track or something like that. I think guidance is still important when it comes to specializing something.
But with the determination of being a specialist on your own is admirable. I think people with that kind of attitude is powerful. Just an advice, try to be open too, you might end up isolating yourself from others.