Install Xfce on Arch-Linux 2012/2013
The Tutorial shows you How to Install and SetUp the Lxde Linux Desktop on Arch-Linux 2012/2013 and Current with Systemd Lxdm Display Management.
All Steps are Clearly Delineated Reducing at Minimum the Eventual 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 :)

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Prerequisite for Lxde is the XOrg Server Installation & SetUp:
XOrg Installation Arch-Linux