Finally, while relaxed, visualize giving the speech. Talk it out and realize that fear is irrational. Shifting Speaker's Orientation Away from Performance to Communication. This is the method I often use. Although we need to be concerned with basic delivery such as eye contact, gestures, body language, etc.
Students commonly make the mistake of trying to memorize speeches.
Know what ideas you want to get across and concentrate on the ideas, not the words. If you attempt to memorize your speech, you will undoubtedly forget a word, go blank, and panic. Memorizing a speech word for word is the worst thing you can do. Reading a speech is boooorrrrrriinnnngg. Don't do it.