InDesign to Kindle (follow-up from ID Magazine article)

Hi — I’ve been wrestling with converting a book with lots of graphics to Kindle format. I’ve produced a validated epub, but now I have to get it to acceptable Kindle format.

I read Kevin Callahan’s article about this in InDesign Magazine #72, but I need help understanding what it says about coding adjustments related to the cover (pp16-17 of the article). Can anyone help me with the following:

1) The article advises that I need to remove various references and files if I have designated a cover during epub export (as otherwise two covers will display in the Kindle file). If I place a cover image on the first page of my InDesign file, but then select ‘None’ for the cover option in the epub export dialogs, does this prevent cover duplication and therefore eliminate the need for the recommended coding adjustments — i.e. deleting cover.xhtml, modifying content.opf to remove Manifest and Spine references to cover.xhtml, and removing “links to this page from your toc.ncx, navigation file, and internal table of contents”?

2) If I can’t avoid the article’s instructions cited above by selecting ‘None’, can anyone please clarify for me a) what is meant by “this page” when the article says “removing links to this page . . .”; b) where I find both the “navigation file” and the “internal table of contents”.

Any advice would be most welcome!