Inspect the spine of the book and look for a smaller name under the author. Turn the book over and look at the spine—the thin side of the book where the pages are bound to the cover. If there are multiple names on the spine of the book, they are always ordered with the author’s name first, and the editor’s name after it. On most books, the editor’s name will be smaller so that a passerby can quickly tell who the author is.
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As one person who “woke up and decided since I’m published and an English major, I should be an editor,” I can see your point of being only one type of editor. I’m not a good copyeditor at all and don’t offer my services for that situation. It’s funny that you would say a traditionally published type editor would be better than the independently published editor. I found this to be totally untrue since I have worked with both. My traditional editors from St. Martins Press and Bantam books working a total of 35 years in the industry, was the worst editor of all. My independently published editor/book coach, is the most knowledgeable. So there is a bit of a disparage. It’s not an absolute science, editing.
There are a lot of editors out there with no actual editing experience working with a publishing company, newspaper, journal, or other business that requires a high level of expertise and provides training for editors. Without working in such a position, it’s very difficult to obtain and master the skills required to become a great book editor. It’s not impossible, but it is unlikely.
Freelance editors normally do not double as literary agents. Not only is it not our area of expertise, but it can actually lead to ethical quandaries. There have, unfortunately, been cases of literary agents saying that potential clients’ work “has potential” but needs to be edited (by them or their employee), for an exorbidant fee. It would also be possible for editors to give the impression that they are guaranteeing publication of a project, when that is something no one but a publisher can do. Many professional organizations forbid their members to combine these two roles, to avoid a possible conflict of interest.
Regarding your last question, I know of no editor who gives a money-back guarantee for occasional errors that happen to slip through or for a different opinion by a later editor. I’m afraid such things are just the nature of the publishing beast. But by having a shorter portion edited first, you will get a decent feel for whether someone is the right editor for you, and will be able to be confident in his or her work on your entire book.