Final answer:
A speaker should take slow, deep breaths to calm nerves before presenting, practice facial expressions and gestures, engage the audience, maintain eye contact, and monitor body language for a confident appearance.
Step-by-step explanation:
A speaker experiencing nervousness before a presentation should take slow, deep breaths before speaking. This technique can help calm the nervous system and reduce anxiety. Other strategies include ensuring that your media engages the audience to make the speech delivery more dynamic and practicing the speech in front of a mirror to monitor and control facial expressions and gestures. It is also beneficial to maintain eye contact as it may help in connecting with the audience and appearing more confident. Additionally, it is important to monitor your body language to present a positive impression and convey a confident and professional image.