Assuming you have a good copyedit, there is a trial and error learning curve on how to go from a Word file to a good Kindle ebook in terms of paragraphs, formatting and such. The most difficult part of do it yourself is a good cover. Good cover design can be very important. People do judge books by their cover - especially ebooks.

Some links to discussions:

http://accordingtohoyt.com/2012/02/0...e-im-going-in/

http://madgeniusclub.com/tag/book-covers/

http://madgeniusclub.com/2014/12/20/...er-typography/

Make sure that if you use clip art that your art is licensed for the purpose you want. Read the license.