Windows 8.1 and Ubuntu Linux & Kali Linux

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http://askubuntu.com – I've heard a lot of things about the relationship between Windows 8.1 and Linux Distros. (Specifically Ubuntu & Kali Linux) I want to dual-boot Windows 8.1 with Kali Linux. But i'm unsure if anything is going to happen to it. I DO NOT want to format my pc and re-install Windows. I've read that some people had a real bad experience with dual-booting Linux distro's with Win8.1. Can someone give me a pointer or guide me a bit? (HowTos)