Know your content
Some simple steps.
Step one, know your content aloud and alone in your room.
Step two, know the content with people passing by. By standing up and reading the content aloud around others but not talking to them.
Step Three, record your presentation of the content. Review adjust and repeat.
Step four, rent a crowd, family, friends, or free beer will get you a crowd.
Step five, full dress rehearsal, video recorded, rent-a-crowd, and in the venue if possible.