Ah, I miss-wrote. I meant "arranged" by the author when I said "done" by the author. As you and the other commenters say I meant an author can go out and find an editor/proof-reader/cover-artist etc. and pay them directly for their work. I've written enough reports to know full well that an author can't proof read his/her own work.
Ah gotcha. Certainly you can hire your own. A small industry of people who want to edit and willing to work for less than the big names seems to be cropping up around the self-publishing industry.
What's really going to be fun is to see how many OTHER business opportunities crop up around those who wish to self publish. As I go through my own writing and beyond I'll certainly be looking at areas that beg for such.
