KDE was my first time desktop environment when i meet with linux operating system. It was KDE 3.5 six years ago. Now kde is more better, that i want to install it again in archlinux system.
My current archlinux system is using LXDE Desktop Environment, and have login manager (LXDM), so plasma/KDE will be autodetect on LXDM. You can search on my blog about LXDM.
Install KDE/Plasma Desktop:
$sudo pacman -S plasma plasma-meta
Logout and login with Plasma desktop (I'm using LXDM). If you have problem such as "Could not sync environment to DBUS" just reboot or restart archlinux.
Here's default KDE/Plasma Desktop on Archlinux:
Start menu & File manager:
Software center (Application & Plasma add-on):
Ok that's about installing kde. :)