Do this.

Get some software for screencasting, and then go ahead, talking while doing.

Make a written script, or at least THINK before you begin, and make a few “not-so-great” movies before you complain about your voice. When you start liking it, even mistakes in videos are not that hard to live with.

This has gone well for me when I have done things that challenge the status quo (wrt hearing my own voice recorded).