I implemented this way of working years ago and see how empowering it is for authors, and helpful for editors to boot. This doesn’t mean you’re asking your editor to do a free sample edit. (I discourage editors from doing this and caution authors who push for it as asking editors to work for free before you hire them may result in resentment.) Paying an editor for a few hours of their time to ascertain whether they’re a good fit for you is a great way to put your toe in the pond before submerging yourself. You can then see for yourself if the editor’s suggestions and comments resonate before moving forward with the whole project.
It’s best, if you decide to hire a freelancer, to figure out what the going rate is for the service you need, and expect to pay that amount. Otherwise it may turn out to be a waste of money, because the quality of the service will suffer. Sometimes there are payment plans to help with high costs! But it’s really a good investment to pay industry standard for editorial services; I agree with Shayla.
Reach out through an editor’s professional website. Many professional editors offer their services on a freelance basis or use their website to advertise their press’s opportunities. Perform a simple search online using the editor’s name and look for a professional or personal webpage. There will be information about contacting an editor on their website.
2. Copyeditors aren’t the last line of defense when it comes to a book’s mistakes. Formatting, which is done after an editor has done their job, can lead to unintended errors being introduced into the text. That’s why it’s important to hire proofreaders to comb through edited text *after* the book has been formatted for print or digital. Proofreaders are your last line of defense—but they’re human too.