[weberr]

I have Kindle Fire -- which likes MOBI and AZW format. If I don't like the way things look, or want to clean up a PDF file, or want to create a TOC, I use Calibre to generate an EPUB file and then use Sigil to edit the file (has great WYSIWYG editing interface with Word-like options), remove page headings and numbers inserted from the PDF version, and/or create a TOC from headings I choose. Save it back to the Calibre library and convert it back to MOBI if necessary.

Also found that if you want to make large-scale changes -- especially font changes, copying the 'book view' into Word, using the full capability of Word to edit/change/insert anything, saving it as an html file, and importing the html file into Sigil works too.