The past year was not easy on investors. Between the crisis in Greece, the market turmoil of August and September, and the first interest rate hike in nearly a decade, 2015 was a year to rattle nerves.

The market's tumble at the start of 2016 trading is giving investors little reason to believe the new year will be any gentler. But before you go into a defensive crouch, remember that this could be a great time for you stop, think, and plan.