Yup, there isn't an official "upgrade" path from Pro to Home so it pretty
much necessitates a clean install. The CD ROM disc is bootable, by the way,
and can do disk work [partitioning, formatting etc.].
Before doing anything though back up to removable media or someplace off
computer all and anything one wants to preserve in terms of data, docs,
files, music, vid and address books etc.
Good practice is to take stock and arrange to have all drivers lined up and
burned to disc and product CDs and product keys handy. Also, if need be,
make sure one's Internet connection settings are written down or available
etc. etc.
Also make sure either the Home disc already includes SP2 or that SP2 is
downloaded and burn to disc beforehand for immediate application. DO NOT
connect to the Internet if the installation of Home does not already have
SP2 either integrated or applied. Why? Versions of Home that are pre-SP2 are
extremely vulnerable to compromise when connected to the Internet .. they
can be compromised within minutes, well before you have a chance to get
Windows Update to apply the service packs and patches.