Welcome to LQ. Assuming that /home is on a separate partition, you could simply install v10.0, using your existing partitions. (Just don't reformat /home, or you'd lose your personal data.) Given the number of packages in any distro, a clean install at least for me is a whole lot easier than trying to manage an upgrade. In brief, I have found that by keeping /home as is, and installing the new distro "around" it makes things pretty easy. Note also that as long as you kept the same filesystem (ext3, reiser, and so forth) you could also use this approach to switch from one distro to another.
As always, anytime you are performing any major work on your system you should backup any important files. Good luck with it