Calibre Companion would seem like a good idea, except for two reasons:
(1) Comments on the Amazon Appstore seem to indicate it wouldn't work with the 2nd Gen Kindle Fire...i wonder if it will with the HDX
(2) I have less than no clue

about how to set up the wifi connection between Calibre and a reader--ive always used USB. Can Calibre Companion be used (if it will work on the HDX) with a USB connection?