KDE vs Gnome

Summary:
Having the Gnome desktop you want to try the KDE desktop  (or vice versa)

Main post:

• Download the kde packages
  sudo yum install kdm (this is only the startup manager)
  sudo yum install kde
• Setting KDM as startup manager
  su -
  echo "DISPLAYMANAGER=KDE" > /etc/sysconfig/desktop
• Choose your desktop environment
  switchdesk (switch from Gnome to KDE desk within your session)
• Kill your XServer from console
  in Gnome:
  cd /etc/init.d/
  sudo gdm-stop
  in KDE:
  init 3
• Start your XServer
  xstart