You're right, it IS difficult for many artists, myself included to speak about our work. It's not even the public speaking aspect of it, really. It's 100% preparation to speak. I get lost in broad questions, where people want me to talk about my body of work as a whole, but there's so much variation that it just can't be explained from any one single focus of inspiration.

Great post. I hope I can make it out to hear one of your talks some day. :)