Someone once said that the two most important things in developing taste were sensitivity and intelligence. I don't think this is so; I'd rather call them curiosity and courage. Curiosity to look for the new and the hidden; courage to develop your own tastes regardless of what others might say or think.
Originality cannot be a goal. It is simply inevitable. The truly pathbreaking step can never be predicted, and certainly not by the person who makes it at the time he makes it. He clears as he goes, evolves his own techniques, devises his own tools, ignores where he must. And his path cannot be retraced, because each of us is an original being.