Make two marks on your mirror on a level with your eyes, and think of them as two human eyes looking into yours. Your eyes will probably blink a little at first. Do not move your head, but stand erect. Concentrate all your thoughts on keeping your head perfectly still. Do not let another thought come into your mind. Then, still keeping the head, eyes and body still, think that you look like a reliable man or woman should; like a person that anyone would have confidence in… While standing before the mirror practice deep breathing. See that there is plenty of fresh air in the room, and that you are literally feasting on it. You will find that, as it permeates every cell, your timidity will disappear. It has been replaced by a sense of peace and power. The one that stands up like a man and has control over the muscles of his face and eyes always commands attention. In his conversation, he can better impress those with whom he comes in contact. He acquires a feeling of calmness and strength that causes opposition to melt away before it.
Also, sit in a comfortable chair and see how still you can keep. This is not as easy as it seems. You will have to center your attention on sitting still. Watch and see that you are not making any involuntary muscular movements. By a little practice you will find you are able to sit still without a movement of the muscles for fifteen minutes. At first I advise sitting in a relaxed position for five minutes. After you are able to keep perfectly still, increase the time to ten minutes and then to fifteen. This is as long as it is necessary. But never strain yourself to keep still. You must be relaxed completely.