Practice your first 8 minutes so that your presentation is ingrained but not memorized.
How do I practice? If someone is not available to listen to you live, record yourself while driving, then listen to it during drive time to critique yourself. When practicing your presentation if front of someone, have them count your “um’s” or “ah’s” as well as any other speech patterns such as speaking too quickly, distracting body language or voice inflection. (In the absence of voice intonation or modulation, people will assume the most negative connotation of your message.) This will bring those words or actions from your subconscious to your conscious mind.