Oral presentation appréhension!

I do not have really any concerns about my presentation except if someone ask me a question and I am not sure as to how I should answer it.  I enjoy talking and especially something that I enjoy talking about.  I also enjoy people so speaking is not an issue.  Two ways I think would be to help if I could not do public speaking is by taking your time with the presentation, and also breathe I can't tell you how many people I see start to hyperventilate and tense up when they are speaking publicly.