A presentation will be as excellent as its preparation and planning, thus it's critical to not only have your information prepared, but also to feel mentally prepared. Developing personal confidence is an important aspect of the preparation process, along with reviewing any Powerpoint presentations and gathering other materials.
Try and listen to your favourite tracks before giving a presentation to boost your confidence and energy levels. Try imagining yourself in the footsteps of someone you like and adore to boost your confidence. Consider the attributes you admire in that person, whether they are a friend, advisor, or a reputable public figure, and question yourself what they'd do in your circumstance.