Imperetive. If you are not confident in making your presentation to a person or a business, then pay a professional to do it for you, your presentation can make or break you. This way you are still available for questions later.
I do speak from years of experience here, so please note this extremely important point. Always be sure that the person you are speaking to is not the DI that is the decision influencer. You must speak and present to the DM that is the decision maker. There's nothing worse when after the presentation is given the person says something like ''Thank you very much, your presentation and ideas are very interesting, I will pass them on to Mr. xxxxx '' That's it, your main chance has gone, you should have made sure of the standing of the other person.
I hope this help's you and anyone else in this situation.