Some indie authors might not have the funds for an editor - or worse, might think that they don't need one. It's not uncommon to come across quite a few spelling or grammar errors in self-published books. Some have far more than others. At what point do errors ruin your reading experience? Are there any kinds of errors that particularly bother you? Do you think authors should always hire an editor before publishing a book? I think the worst errors are not so much spelling or grammar errors, but when they get character names confused. I read a book recently, The Saga of Bridget and Amanda, where they renamed a character right in the middle of a scene. Another character changed names halfway through the book for no apparent reason.