It's somewhere between zero and huge depending on how much you do (or can do) yourself. Then there is marketing, somewhere between zero and huge depending on how much you do (or can do) yourself.
There many are better articles. Also of course it doesn't mention that once you have the metadata, blurb, cover and content as an epub, there is zero additional cost to ebook publishing almost everywhere else.
Self publishing on paper involves also paying production cost and shipping for a proof when you have the final cover wrap image (size of spine depends on paper thickness and number of pages) and print ready PDF.
It's not a very good guide. It can't at all be described as perfect.
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