don't take drugs.
Anxiety is derived from thinking about the future. You worry about something that hasn't happened yet. For one, stay focused on the present moment...the now. don't think about how you can fuck up or embarrass yourself or whatever crazy thoughts pop into your head, because you will have anxiety. In fact, don't think about the moment of the presentation at all.Anxiety also = lack of confidence... which is ok. just use things to make yourself more confident
secondly, know the material like the back of your hand. practice it. do a couple of practice presentations and use the same voice/tone you would use. After a few times, you'll have it basically scripted/programmed and it'll be alot easier. Don't be lame or a robot....have fun with it too. Incorporate more natural language and you'll feel like you're just talking to 1 person
Also, this may sound off, but it works....before/after you practice it, tell yourself (out loud) that you are the most articulate, confident and knowledgable salesperson/presenter alive. and don't just say it meekly...project it with a strong tone and authority.
if you verbalize stuff, you begin to believe it as the truth
I used to be a nervous fuckin wreck in front of people...or when pitching clients over the phone but exposure to whatever you fear or repitition breaks fear EVERYTIME. i'm on the phone all day long now/pitching/selling people and i act/make myself believe i'm the president of the universe lol (in a non cocky way)..you can train your mijnd to think that way. One of my favorite things in m business now is to actually run a sales meeting talking to a room full of newbies or people in my team....it's like an actor performing but before i would have shit my pants
i have a couple of NLP techniques i use for that type of shit too to prevent anxiety, but it'd take a while to explain them. just use the above