Re: Pass the Xanax please..... Where do I start, to do an upgrade?
yes, you can (and it is recommended) have a test site in a different directory form your live shop - a separate database is also recommended.
Upgrade procedures are described in depth in your /docs/ directory and in many places on the forum and WIKI.
Please do not PM for support issues: a private solution doesn't benefit the community.
Be careful with unsolicited advice via email or PM - Make sure the person you are talking to is a reliable source.