If you want to give an excellent presentation it is important to practice. You can best practice your presentation at the actual location where you need to give the presentation. It may not always be possible, but try to arrange for practicing the presentation at the location. To practice at the location will have a lot of benefits. One of the benefits is that you can test all the tools and equipment at the location (for example projector, microphone, etc.). There are a lot of things to consider when you practice at the location. Read more about it in the book Public Speaking Excellence – Tips and tricks on how to become an excellent presenter.