Being able to present is essential in sales. Whether you are presenting to one person or a room full of people you need to develop the basic skills or you will be missing out on opportunities to get your message out there.
Giving talks and seminars is also a good way of generating leads for accidental sales people. I now speak regularly to large audiences when once I was terrified of even speaking to people I knew really well. Speaking is a learnable skill and the more you learn and practice the better and more confident you will become.
This e-book is full of useful tips on giving speeches and presentations. Although not written for a business audience, the information is valuable all the same.