Limit the scope. Keep the speech pointed to a logical conclusion. Spark listening interest. Determine the benefits for the listeners, then emphasize those benefits in your talk. Memorize ideas, not words.
Memorized talks are deadly dull.
Odds are you will forget what you memorized. Practice, practice, practice, before a friends, collegue or using a tape recorder and vidio. 7. Make friends with the mike and audence. Avoid too many hand mannerisms. Watch those shuffling feet, too.