If you’re producing ebooks, you’ll want them to be professionally formatted. Yes, you can do it yourself, but remember that your books are a business: if ebook formatting is not your expertise, then have it professionally done to ensure a great quality product. I work with eBook Partnership in the UK for coordinating formatting on my clients’ books.
Matt from eBook Partnership is spectacular to work with: he gets back to you quickly about any projects, and he’s always available via email or phone if you need to get in touch. He does print-to-ebook scanning and formatting, ebook conversion and formatting, and ebook distribution.