Then play the audiotape in your car as you drive to and from work. Hearing your words over and over again in a particular sequence will help you remember the content. Notice specific sections where you can improve. If you happen to get stuck in traffic, you can make good use of your time by playing and replaying your speech. You are refining your talk.
Refining allows the average speaker to become good and the good speaker to become even better.
Practice your talk in front of a small group of friends and colleagues. Ask them to provide you with written feedback. If several people are reacting the same way to your presentation, pay close attention. Don't debate with your feedback providers. Just listen and take notes.