You might need a partitioning program which can run fairly expensive, or there might be one included with the book.
I attempted it on an old computer and the disk wouldn't partition correctly (I suspect because the software was even more outdated), but I learned everything else.
You should do a backup before you touch any of your settings, though. You might be better off getting an experienced friend to help you through it, too. Dangerous stuff, tampering with your computer.
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