Personally, I would never work with a self-publishing company because it's entirely possible to learn how to produce a very high quality book on one's own, and I'm cussed enough to not want to pay someone for work that I am capable of doing myself (and over which I maintain quality control.) So yeah, I've spent time learning the steps involved in editing, formatting, production, and eventually, marketing. I had a leg up because I'm also trade published and have learned about the publishing world through that process, but I'm a knowledge junkie so I belong to online groups dedicated to self-publishing and read about what other people are doing, do a lot of research, and take notes...but that's just me.
May I suggest you have a look at the threads here in the self-publishing board where members have detailed how they've gone about self-publishing their books? It might give you a place to start (because if you can't relate to the word "ebook", you do have a lot to learn about)...and maybe it will make you decide that it's not a path you want to follow. Have you definitely decided not to pursue trade publication?