The Tutorial shows you How to Install and SetUp the KDE4 Linux Desktop on Arch-Linux 2012.10+ with Systemd Kdm Management.
All Steps are Clearly Delineated Reducing at Minimum the Eventuals Choices and Customizations to Make Clearer & Easier the Process.
After if you Have Some Doubt or Need Some More Insight you Should Consult the Official Online Arch-Linux Documentation…
Just Relax & Take the Time of Carefully Reading and Executing the Instructions Contained Here and All should Work Like a Summer Breeze :)