Depending on whose drive you bought, it may very simple. Both WD and Maxtor
offer software with the drives they sell (if you bought the cheap version,
without a box, you'll have to download the software from thier website.)
This software will partition, format, and even do a complete copy for you.
Backup any critcal files first though - I'm not sure in XP because I haven't
done it, but in Win2k there is sometimes a problem because the drive copy
process doesn't catch the swap file - then it won't boot. If this happens,
you can still go back to your original drive and go with one of the other
options, or you can get creative (i.e. move your swap to a second hard drive
before doing the copy.)