There are individuals who are more than happy to stand up in front of hundreds of people and talk on any subject at the drop of a hat. It has to be said, however, that these people are the exception rather than the rule. In fact many studies show the greatest fear many people have is public speaking.
Normally, when you make a presentation, you have plenty of time to prepare. You should make the most of that time. Not only do you need to make the obvious preparation such as ensuring you know the content of the presentation inside out. You also need to ensure that it is going to keep people listening and ideally, entertained. It can also help with your personal development in the long term.
There are of course many subjects which have to be covered, which even Eddie Izzard would have difficulty making entertaining. However, if that is the case, is a presentation really necessary? Frankly if the presentation is going to be dull, it might be just as effective sending an email.
Rehearsing your presentation is always good and, if you can, have an audience. Get their honest feedback. Don’t use presentation aides such as PowerPoint for the sake of it. Think seriously about whether they add anything to the presentation.