By Derek Haines on Just Publishing Advice:
Yes, of course, you can, and many authors and writers are achieving success by taking control of their work and becoming author-publishers.
While some writers work full-time, others use self-publishing as a part-time pursuit and are satisfied keeping their work as a side income. As with any occupation, the adage that the harder you work, the luckier you get, applies aptly to self-publishing.
As long as you provide a quality product to the market, you can expect to sell copies of your book or ebook. But, be realistic. Ebook and book publishing is a competitive and volatile market, so be prepared for some ups and downs along the way.
Apart from money, though, there are many other reasons that attract writers to self-publishing. Here are some that you may not have considered.