The Tutorial shows you Step-by-Step How to Install GRUB2 Bootloader on ArchLinux 2012.
All Steps are Clearly Delineated Reducing at Minimum the Eventuals Choices and Customizations to Make Clearer & Easier the Process.
So if you Have Some Doubt or Need Some More Insight you Should Consult the Official 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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Boot your Arch-Linux Base System
Here is the Guide for Installing Arch-Linux Base-System:
Arch-Linux Base Step-by-Step Installation