Many on this section of AW self-publish through Amazon KDP for e-books and CreateSpace for print books. There are more choices if you want to do it yourself (Lulu, Book Baby). Many self-published authors hire editors and book cover designers. Most authors here have beta readers. KDP and Book Baby have the option of hiring people to help with formatting, cover, and editing.
Which course is right for you will depend on your personal goals for your book, your skill set, and the amount of time or money you have to invest in your project. For me it started as a hobby, then the learning became a distraction to help me through a grieving process.
So far, from all my published material I've earned about $30-$40--which is almost enough to cover the cost of proof copies and copies given to friends and family. I do my own editing and covers because that's what makes sense for my situation; I'm not going to make money from my coloring books. If my goal were to make money, I'd be much better off sticking to my day job with the things I'm doing. For the time investment, I'm at a loss as I've spent hundreds of hours learning by doing. Even so, I can't stop myself from making things to publish.
What are your goals for self-publishing?