Listen to Your Gut.
Any valuation model you may create for a company is only as good as the assumptions about the future that are put into it. If the output of a model does not make sense, then it’s worthwhile to double-check your projections and calculations. Use DCF valuation models (or any other valuation models) as guides, not oracles.
Know Your Friends, and Your Enemies.
What’s the short interest in a stock you are interested in? What mutual funds own the company, and what is the record of those fund managers? Does company management have “skin in the game” via a meaningful ownership stake? Have company insiders been selling or buying? At the margin, these are valuable pieces of collateral evidence for your investment thesis on a company.