Learning a new skill is always scary at first because there's so much you don't know. And learning how to become a successful investor is even scarier, because you're putting your own money at risk.

If you have a wise and seasoned mentor, however, the journey can be less frightening. And if you're new to investing, there's no better mentor than billionaire Warren Buffett, the quirky and brilliant CEO of Berkshire Hathaway, to guide you.

Buffett is in the business of making investors richer, not teaching novices. But you can make him your honorary mentor by following four of his time-tested tips, which can help you build a million-dollar retirement portfolio.

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Source Fool.com