If you have a decent about of knowledge of disk partitions, you should be fine. Depending on which distro of Linux you are installing, you might have to use fdisk, which can be hard if you haven't used it before. If you are using one of the bigger ones, such as Redhat/Fedora, Mandrake, etc, you should be fine. Feel free to PM me/IM me if you need help. I've at least
attempted to get many of the larger distros working.
--EDIT--
In response to your last post, try Redhat.com. I'll look for a the address here and see if it is still up...
Here you go:
https://www.redhat.com/docs/manuals/...titioning.html
Probably focused on Redhat mostly, but it should give you the idea...
-----EDIT-------
I don't know what distro you are installing, but know that most can't resize NTFS partitions (what XP is on). If you download the first ISO for Mandrake, you can resize them. I've never had a problem with it.
----EDIT------
Better than the last URL:
https://www.redhat.com/docs/manuals/...artitions.html