Hm .... Have you even started?
Well, I recommend you get a virtual machine to test your nLited disk, VMWare OR VirtualBox OR VirtualPC 2007.
Do you have all your stuff ? I mean like service pack, updatepack, drivers, add-ons, etc. .
**For drivers, you can take multiple paths. I have used Driverpacks and Drivermax Backup drivers. If you are using the same computer with drivers you are happy with, download DriverMax (
http://www.drivermax.com/ ), read up on the data, and fire up the program and select export. DRIVER UPDATES ARE NOT NECESSARY if you are already happy with your current state.
As for add-ons, these are programs/ utilities you might like to insert in without having to do it after XP install.
Post back on what you are planning to do and ask any questions you have.