You can conquer nervousness with some simple homework. A seasoned speaker may manage to sail through any topic. But, if you are a beginner talk about one subject that you feel confident about. Also, accept speeches that allow you considerable preparation time. You can graduate to impromptu speeches after gaining confidence with well-rehearsed ones. The smaller the gathering is, the better for a beginner to gain confidence.

Prepare well on the subject keeping in view the target audience