All you need to do is download a boot cd from
http://www.megagames.com/dc/dc_utils_bootcd.shtml
(I use Utopia)
Then burn it. The program needed to burn the image is stated in the little description part
(ex: diskjuggler)
Put the disk in you DC and let it boot up, then a screen pops up with a reindeer telling you to change disks. Thats it.