Avoiding where others go wrong is an important step in achieving investment success. In fact, it almost assures it.

Warren Buffett once wrote that value investing is like an inoculation--it either takes or it doesn't--and when you explain to somebody what it is and how it works and why it works and show them the returns, either they get it or they don't.

Value investing by its very nature is contrarian.

Successful investors like stocks better when they’re going down. When you go to a department store or a supermarket, you like to buy merchandise on sale, but it doesn’t work that way in the stock market. In the stock market, people panic when stocks are going down, so they like them less when they should like them more. When prices go down, you shouldn’t panic, but it’s hard to control your emotions when you’re overextended, when you see your net worth drop in half and you worry that you won’t have enough money to pay for your kids’ college.

Costs and liabilities are rarely overstated.

Here’s how to know if you have the makeup to be an investor. How would you handle the following situation? Let’s say you own a Procter & Gamble in your portfolio and the stock price goes down by half. Do you like it better? If it falls in half, do you reinvest dividends? Do you take cash out of savings to buy more? If you have the confidence to do that, then you’re an investor. If you don’t, you’re not an investor, you’re a speculator, and you shouldn’t be in the stock market in the first place.

I don't have a Bloomberg on my desk. I don't care.