Even if you are not the best at everything you do, you should never let people know that. Being a leader is about accepting the negative things about yourself, but not allowing them to stop you from doing your best. This pertains to all points in your life where you may be lacking.
Say thank you to your employees. Many studies have been done on the power of a thanks given from a manager to his or her employees. It increases productivity, often by a lot. Just a little graciousness really can help extend your power as a leader, so be active about it.
In order to be a great leader, you must be able to communicate your vision to your team. Explain clearly what the common goal is, and instill a vision of success in the group. Getting everyone working together on something they all believe in cements your leadership role in the group.
Build trust in your ability to be a strong leader. Let your employees see you work. Don't do everything behind closed doors so that workers have no idea what you actually do. Always be cognizant of your leadership role. Your employees will do as you do, not as you say.
Most people wish to be effective leaders of others, but very few actually succeed in doing so. One of the most effective methods of acquiring true leadership acumen is to learn as much as possible about those who have gone before and the attributes they had in common. The article above can serve as an ongoing resource for anyone wishing to undertake just that sort of study.