What should I look for when choosing a book proofreader?

[cecila]

I'm almost done with my manuscript and now I'm looking for a reliable book proofreader before publishing. What qualities or experience should I look for when hiring a book proofreader? Have you worked with someone who made a noticeable difference, or are there any mistakes I should avoid during the selection process? I'd really appreciate honest advice and real experiences from fellow authors.

[youngstunna]

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