I’m revealing the five costliest mistakes I see new authors make when self-publishing. If you're using your book as a business card, you cannot afford amateur formatting giving bad first impressions to readers who immediately notice wrong fonts and layouts, especially if they read extensively in your genre.Let’s start with the number one mistake that cost my client thousands: formatting your book before all editing is complete. My client paid for formatting before we finished all four editing types—developmental, line, copy, and proofreading—then had to pay for reformatting again after editing changed content.Mistake two involves not understanding different format requirements where authors assume one format works for all book types. However, each book format has specific technical requirements with separate file types that Amazon won't accept if improperly formatted.Mistake three is using manual formatting with hard returns and extra spaces instead of professional paragraph styles, or worse, formatting in Word which looks unprofessional and Amazon often rejects. Mistake four means ignoring industry standards where every genre has specific formatting expectations professional readers recognize instantly.Join my free School community "Publishing for Leaders" at school.com where first 100 members get complimentary access to monthly group coaching sessions plus casual coffee chats. Book your discovery call at write4u.me for formatting, editing, or publishing support.Until next time, keep writing, dreaming, and creating—your book is waiting to be born!