Paramount is your composure and ability to ignore whats happening in the markets when it gets too extreme. Construct a portfolio that you shouldn't need to liquidate atleast for the next 3 years. Be mentally prepared to face a time when your portfolio may be down and you want to buy more but cannot. Never lose control of your cash flows and you'll be fine after 3-4 years. If this is once in a century event, I hope we come out of it and use what we learn from it.