Ancedotal Evidence suggests that the first, most important skill, is being able to admit you are wrong. Taken to far though, and it results in an useless humble platitudes. Paired with being able to look at the universe around you to find what is right, I think it is enough enough to recreate everything. I would go so far as to say that Bayes' Theorem is just a mathematical formalization of those two ideas.
A while back I came across a delightful web developer skill tree, and I was wondering if technical rationality has gotten to the point where someone could make one of these for an aspiring rationalist.
I think seeing a clear progression from beginning skills to advanced ones laid out graphically helps those starting on the path conceptualize the process.