You have to believe that you are good in what you do; and, in order to achieve that, you need to be prepared by properly researching about the topic you are going to talk about.
Waa in aad aaminsantahay in aad tahay mid ku wanaagsan hawsha aad qabanayso; si aad taa ugaadhona, waxaad u baahantahay in aad diyaargarawdo, kadib marka aad cilmibaadhis ku samayso mawduuca aad rabto in aad ka hadasho.