My biggest tip and what works for me is prep,prep, and PREP!
When I prepare and plan my brief and presentation I feel confindent and my mind is more at ease since I KNOW what I am talking about, I have a mini script in my mind.It is more for reference as remembering every word and line doesn’t work for me. I am more focused on conveying the message and idea.
You said you know it backwards and forwards but have you laid it out mentally in your mind piece by piece? Made sense of it? What if someone else was briefing your presentation to you? How would you want it presented and talked so it made sense? Remember this presentation isn’t for you, its for everyone else.
Sometimes I will practice going over it out loud while driving or in the mirror. Try recording yourself (seriously do it) or have a friend or however many give you a quick critique or at least just watch you. Just having a person or more can change the atmosphere even if it is just practicing.
Not sure if this is “frowned upon” pretty normal where I work but I sometimes would have flash cards with bullet points or lines written down. For me this triggers memories for what I want to discuss in case my brain wanders off. I try not to read verbatim from the slide show or cards if you can avoid it. If you have to though do it and move on. Don’t get all discombobulated about it and start making um sounds. Execute and move on. Also make sure the cards are in order and synchronized to your presentation so you’re not fumbling through them.
Typically glancing down at the card or a brief glance at the next slide and taking a natural pause to catch myself and also look around room make eye contact briefly and continue speaking. This helps me at times keep my rhythm if you will or just give me a chance to relax more. Give yourself a chance to breath. Natural pauses are a good thing.
However, all that said if you do start messing up just keep going don’t let any little or big moment overwhelm you. Keep it going and finish. Worse case scenario you goof up or forget something. Give’em what you know and NEXT SLIDE.