It's a lot less frightening than it sounds, actually. Just pop in the Ubuntu liveCD and click on the install icon. When it gets to the partitioning stage, there will be a slider to select the new size for your ntfs partition. Just move it to the left until you have space enough to install Ubuntu. Just make sure that you don't overdo things. You can't make your xp partition smaller than the amount of data it contains. And it may be a good idea to have windows defragment itself (multiple times) before you boot the install cd.
Last edited by jay73; 10-26-2007 at 11:14 PM.