The biggest risk is not taking a risk. In a world that’s changing really quickly, the only strategy that is guaranteed to fail is not taking risks.
I think investment psychology is by far the more important element, followed by risk control, with the least important consideration being the question of where you buy and sell.
You don't need to be a rocket scientist. Investing is not a game where the guy with the 160 IQ beats the guy with 130 IQ.