Nervousness is displayed by different people in different ways. Some sweat and shake, others fidget, some use repeated irritators (like “basically or “OK?”) and some people shuffle their feet.
One of the keys to eliminating the irritators is to remain aware of what you are actually doing, instead of just focussing on the content of what you’re saying. Try to keep your feet planted firmly on the ground when you speak. If you’re going to move, do so decisively, slowly and deliberately. Avoid pacing and jerky movements. If you try and focus your nervous energy in the centre of your body around the diaphragm area, you will have better control of what you say (content), how you say it (context) and your accompanying body movements.