The Guide shows you the Steps for Switching from KDE4 to Xfce Desktop on Debian Linux Wheezy.
To Login into the Xfce Desktop we will Install and Make Use of the slim Display Manager.
Finally, the post’s Content is Expressly Reduced to Give Focus to the Essentials Instructions and Commands.

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Installing the Xfce Desktop.
Copysu
If Got “User is Not in Sudoers file” then see: How to Enable sudo
Copyapt-get install aptitude tasksel
Copytasksel install xfce-desktop --new-install
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Installing and Switching to Slim Display Manager.
Copyaptitude install slim
Choose the slim Display Manager.
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Disabling kdm Display Manager.
Copyaptitude install rcconf
Copyrcconf
Disable the kdm Display Manager.
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Here Setup Slim for Running a Desktop on Debian:
Debian Slim Setup How-toTutorial on How to Setup the Slim Display Manager for Running a Desktop on Debian Linux. -
SetUp Xfce for Starting at Boot.
Copysu <username>
Copynano ~/.xinitrc
Inserts:
Copyexec startxfce4
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Rebooting into the Debian Xfce Desktop :)
Copyreboot
How to Install Evernote Linux Clone on Debian:
How to Easy Download and Install Debian Unstable Sid: