I have studied classical Chinese on my own since 2008, and Mandarin since 2009 (except for one introductory course at KTH). Be aware that some of those years were spent forgetting rather than learning, so do not assume too much.
I compiled the resources below many years ago, but since they may still be of use to someone I leave them up here. I no longer use Cangjie input method, but sometimes handwriting input on my phone to keep some basic handwriting proficiency alive.