Practise,,, Practise.... That is The Only Way... And Dont Look At Those People In Front Of You..Make A Mind Map And The Notes Should Go In Your Head...Making Yourself Thorough Is TheOnly Way
Trying to be zen and peaceful, other more, practicing the speech by heart as possible as you can, just think of one of things that you should do it naturally before the class. Anyway, you have to have a positive thought, organize well and take it easy before making your speech.