Most business mistakes are irreversible setbacks, but you get another chance. There are two things in life that you don't get another chance at - marrying the wrong person and what you do with your children.
What an investor needs is the ability to correctly evaluate selected businesses. Note that word “selected”: You don't have to be an expert on every company, or even many. You only have to be able to evaluate companies within your circle of competence. The size of that circle is not very important; knowing its boundaries, however, is vital.
I have no use whatsoever for projections or forecasts. They create an illusion of apparent precision. The more meticulous they are, the more concerned you should be. We never look at projections, but we care very much about, and look very deeply at, track records. If a company has a lousy track record, but a very bright future, we will miss the opportunity.
It's going to be tough because the economy is going to be getting worse for a while. And it might fall off a cliff if this doesn't pass. But nobody will ever know that if it does.
The most common cause of low prices is pessimism - sometimes pervasive, sometimes specific to a company or industry. We want to do business in such an environment, not because we like pessimism but because we like the prices it produces.