Easiest way to install the Legacy Rom is to copy the update.img file to the SD card or to the internal memory. The update should come up automatically. More info can be found in the dedicated thread:
http://boards.dingoonity.org/gpd-devices/%28rom%29-legacyrom-kitkat-for-gpd-xd/
Thanks Chris. Appreciate all the assistance. I just want to be fully prepared and informed when I finally receive my xd.