How do I publish a book?

Subject librarians learn to expect the unexpected.  Today's question is: How do I get a book published?

1. Are you looking for a publisher, or self-publishing?
2. Here's a self-publishing guide, on Tom Andry's blog.  Our thanks to Pat Thomson for her advice here.  We bloggers stick together!
3. Pat also suggests this self-publishing guide: 25 Things You Need To Know, by David Carnoy (on the CNET Reviews website)
4. You need an ISBN;  this will make it easier to sell and promote your book. Here's a useful link: http://isbn-information.com/get-isbn.html
5. So, to get an ISBN, where do you go? In the UK, it's Neilson Book Services.
6. You need to have publisher status.

NB: we don't claim to be experts! Any useful info that comes our way will be added here in due course.