I've got the KDE Mint 17.1 on my backup PC. Both Mint KDE and Mint Cinnamon are a doddle to install. You just follow the prompts for language and time zone and make a careful note of your user name and password. The tricky bit comes if you do a dual install and you are asked for partitioning choices. I usually use a new or wiped hard drive so there is no problem. Linux does not call your drives C, D or E. it has names like sda1 and each partition is treated like a separate drive so sda1 and sda2 are partitions on the same drive. Another drive might be named sdb1. This doesn't matter if you install on a fresh hard drive, you just accept the default options. I use a USB hard drive to store files I want to keep. I back up my browser favourites every so often on this and attach it to my new system after the install so it is never in danger. You don't have to worry if the very expensive system you buy turns out to be rubbish. Linux is free. (you can donate to the project if you want to) If you don't like the version you have just try another.