A great leader can make decisions quickly. Better than most, he or she can efficiently break a complicated problem down into its component parts and take action. Without hesitation. Without fear of being wrong.
Do not be afraid of being wrong. While leaders can only build great things with higher batting averages, it takes practice to hit the ball. With enough experience and mistakes, you should have better chances at making good choices. Over time, two wrongs can make a right.
Opportunities for decision making start small. If you cannot decide where your indecisive group of friends should dine together, then you probably cannot make important product, market, or life decisions.