Putting your user home folder in a separate partition away from your system partition always makes it easier for you when you are going to perform any overhauls.
The following are really good guides on how to do this.
http://chris.pirillo.com/how-to-move-the-home-folder-in-os-x-and-why/
http://macs.about.com/od/diyguidesprojects/qt/Move-Your-Home-Folder-To-A-New-Location.htm
