I need to do the install at home. The hard drive will go into a computer at work for booting. Most search results I pull up on google deal with dual booting Ubuntu from Mac/Windows.
A few options.
Hook up the hard drive (maybe a second hard drive, through USB or eSATA) then insert the Ubuntu DVD and make sure you select that you want to install on the work hard drive
On a live Ubuntu system clone your hard drive using clonezilla or dd
Create a VM which uses the real hard disk as the virtual hard disk then install within the virtual environment using the Ubuntu DVD