Nowhere, I'm glad you're starting to see what enabling is and that you are not being told to abandon your sister but to stop enabling her. Keep on reading, and try putting some of the things you learn into action.
Consider Alanon again, knowing what you now know about enabling and so on. You are NOT alone, your situation is NOT unique, and there are many who have stood in your shoes before. Please try to take in what they have to say.
Again, take care of yourself. Your sister has to find her own path, and the best way for that to happen is for you to get out of her way.