A Steve's note: The key to thriving as an investor is avoiding big mistakes. One of the most common times to mess up is when things get tough – when the pressure's on. But you can take a couple of steps to make the right decision when a stock you own is falling. The essay below – which I first shared in 2014 – tells you exactly what to do... Right now, one of my stocks is crashing... What should I do? What do you do in that situation? You know you will face this situation sometime with one of your stocks, if you haven't faced it already.