Agreed, about watching someone first unless you have ,more thasn one computer online. If you have more than one system online you can be walked through. I much prefer michael stevens tutorials for installing:
http://michaelstevenstech.com/cleanxpinstall.html
The reformat part is rather simple, its the occasional hardware snag that gets people in trouble and they land at my shop with pc under arm..Your may need drivers for several hardware pieces and you may not. All systems react differently....
Are you having specific problems ?