For most of the evening, I've been documenting step-by-step as I've built a clean dual-boot system with Windows 8.1 first and then Kubuntu 14.04 second. Take a look, let me know what you think, and if you'd like to see any other scenarios that I can reasonably reproduce.
https://www.kubuntuforums.net/showthread.php?65253
Enjoy!
https://www.kubuntuforums.net/showthread.php?65253
Enjoy!