After the program tells you conversion was successful, be sure to preview it by loading
it into the Kindle previewer.  Try out all the guide items and table of content chapter links.  Make sure you don’t have random blocks of blankness showing up in the pages. Check that the title page information is well balanced on the page. Go back to your .doc file to make any changes, re-save as web page filtered, re-upload to the conversion program, and whiz through the process again, since you’ve already practiced it once.  Preview again. Correct as necessary. When it looks perfect on the previewer, you’re ready to re-visit kdp.amazon.com .

(But seriously, get April’s book.)