Anybody who says Kali is a bad idea for a new user is just naive. Kali Linux is nothing more than a branded up version of Debian with a few hacking tools. In my opinion, Offensive Security kept it so pure to the traditional Debian base system they built from, there is almost no difference under the hood. Most pentesters follow a standard procedure to attack a system, which usually only requires knowledge on using the programs, the operating system is not really something they need to master, let alone even care about (To a degree). However I do aggree with Factionwars opinion that it usually is a fucking bad idea in the sense that some 12 year old now has the power to 'hax'
Installing Kali Linux is a piece of cake even for an extremely basic user, without ANY experience of Linux. Before bothering to install it, make sure you understand some fundamentals to how a Unix-Like system works (Such as su, root, and the philosophy behind an open-source operating system.
1) Either burn it to disk or use Unetbootin to put a bootable Linux Distribution on a USB. Some Linux distributions wont work this way, but learning this step means you can prepare almost any Linux Distribution
2.1) If your BIOS can support booting from USB, then the obvious step is to boot from USB. If you seriously fail this step then refer to the manual your motherboard came with and find out the how to change boot priority to USB.
2.2) If you are booting from optical media, then don't worry about this step.
3.) Follow on screen instructions, preferably, do this to a clean hard drive so you don't have the fear of ruining data if you are not confident in partition tables.
3.1) If you are installing through a virtual machine, then don't worry about ruining data with partitioning.
4.) It should be done and working. Any particular issues are easily diagnosable. Considering you are new to the whole world of technicalness and Linux, it might seem a bit intimidating to use. But in the long run, assuming you have a brain and use it, then it will all fall together.
Best of luck man