To self-publish a book, you have to write your first draft. Then, self-edit your book to ensure the high quality of your book. However, you can also consider hiring a professional editor. Then create a professional-looking book cover. Also, format it to ensure it is ready to be printed. Then select a platform where you want to publish your book. The popular options include Amazon Kindle Direct Publishing, Ingram Spark, and Lulu. Then, set the price of your book and choose royalty options. Once you publish the book, it is also your duty to market your book to improve sales. Moreover, you can also hire a book publisher if you don't want to self-publish your book.