You can non-destructively partition the HD so that the win2k stays put. (BAck it up though!)
My suggestion is, although you will have internet, I assume, on the win2k partition, you don't want to boot into it every five seconds and post a question and do a google search.
A suggestion: Buy a book with a cd rom so you have a hard copy to go by. It will help just to have a glossary to browse in . It will also get you through the partitioning--you want to look into a program called FIPS.
I bought a out of date suSE 6.2 book for ten bucks on a clearance table. and didn't really use the suse, I downloaded RH7.2 after practicing and messing around with the suse distro.
I still use the book.