What? Yes. Never trust your editor.
When you are an indie author, there are a few things that you have to do by yourself, or, and this is the ideal, hire someone to do it for you.
You need to focus on your writing, you don’t have a deadline, so if you keep surfing around, gathering information and waiting for inspiration to kick in, you will never finish your book.
You need to re-read what you just wrote. Several times. Look for typos, repeated words, and read it aloud, to make sure “it sounds right”.
Find a beta-reader or a professional proof-reader. This task can be done by a friend, a member of your book club, or you can pay for it. Never trust your spell-checker, that is not enough.
You need a professional editor, or two. They will make sure your book is perfectly written, they will fix the typos, the grammar and the punctuation. They will even suggest to change a few words that don’t match with the context and will send you a new file “ready to publish”.
Editors are human beings too (I believe), and they make mistakes too. You should never get a copy of your book and publish it blindly. And even if they didn’t make any mistakes, you may not agree with all the changes made and decide to go back to the way it was written at your own risk.
I have read several indie books in the last couple of weeks, and every single one of them had typos and grammatical errors. I am not an English professor (not even close), I am not an editor, and I do make mistakes when I write, many mistakes. The ideas just come too fast into my mind to stop to check the grammar, but that is why you need to do all the things I mentioned before.
Your book is your baby, is your work, is the way people will get to know what is inside of your mind. Then why show it to the world when it is not ready?
Some indie authors may think that hiring a professional editor is a waste of money. “I will wait to see if I sell anything, before investing my money on this book”. Well, if people read it and it looks like they bought the first draft of a very nice story, they will leave you a negative review. They will tell everyone that your book is not well edited and that it was hard to get into the story because of all the grammatical errors distracting them. And we all know that bad reviews means no sales.
There are several websites where you can find affordable and professional services for authors, edition, covers, illustrations, everything you need. You just need to look for what works for you and assign a small budget to make your book ready to publish.