Even if it seems obvious, it is frequent that the increase of the level of stress is bound to a lack of preparation. The alarm "you are not up to it" starts up, the stress rises until the fateful moment to speak.
2/ Reconnect to your knowledge, see your passion for the subject
You know about what you talk then share it rather than your fear of being wrong. The passion is communicative.
Just Before beginning, close slightly your eyes, anchor your fette in the ground, listen to your breath, eventualy put your hands on your stomach and breath out deeply. Leave the subject appaers in front of you on an imaginery screen. Give this word or sentence the color, the aspect you wish. Inspire slowly this subject and smile to it inside as to a dear friend.
Your attention must be quite turned to your subject, here and now.
3/ Décide WHO you want to be
Come to the previous point, take a moment to de on the person you want to be during the presentation. Certainly not the under stress and ill-at-ease person.
Close your eyes and adopt the physical and mental posture of the personn you want to be, the image you want to give.
4/ Connect with people in the room
They are people as you and me, connect with their humanity and what you have in common with them. Do not trust the grumblers or the rouches ! Speak as if you speak to each one personnaly and make it about them, not about you.
Few days before going on stage, think what, in practice, would make you feel more confortable and would allow you this connection to the audience.
5/ Imagine the meeting as the success you wish
You can train alone several days or weeks in advance. A relaxation therapist will can guide you with visalisation exercises.