I have a 280 gig Harddrive, which came partitioned into C: and D: drives by default (144 gig and 140 gig respectively). I've already nearly filled the C: partition, and there is a good 60 gigs of data on the D: partition.

Once I get to the partitioning part of Ubuntu installation, how do I proceed from there? I'm going to use the D: partition to install, or at least break it into a new 10 gig partition correct? And I need a 256mb Swap partition as well. So how do I break the D: partition apart to comfortably install Ubuntu, and not risk losing my data?