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So, you found a self publishing book company and you're ready to go. Not so fast! Before a printer prints your books, be sure that they provide proofs (printed test runs). Once you are provided with proofs, go through them CAREFULLY. Make sure that you look for any printer's errors (anything that was not in your original copy)—you will not have to pay to correct these.
However, if you find errors that were in your original file you will probably have to pay to have them corrected as they are your error and not the printer's (although some printers do dive an allotment of freebies). In any case, be sure that you examine each and every page of your proofs in great detail to ensure the production of the best possible books.