Powerful presentations require a process for preparation, and practice. A great timeline for preparing a powerful presentation is around 10 days. Every great speaker I have ever worked with has a process they follow, although they are all slightly different.
First, realizing that there are no shortcuts to creating and delivering a great talk, and second taking the time to plan the development as you would a project, will create more impactful delivery outcomes. Clients are always amazed how less stressed they are when they take this approach.
Developing a process for preparation, outlining the process, and approaching your presentation development like a project, will reduce your stress in speaking. Allowing time to practice delivery, with video feedback, will make your delivery more impactful.
Now, take a few moments to design a draft outline of the process you will follow the next time you present. Here is a sample to help you get started.