I went to my cpanel and created a database and then a subdomain. Then I installed Jamroom into the subdomain at http://sandbox.indiegospel.net It was easy and could be done in 10 minutes.
The only issue I had was with the .htacess file. Apparently it has some values which don't work with the particular server I am on, even though the server meets Jamroom requirements.
So these two values had to be deleted (AddHandler php5-fastcgi.php Actionphp5-fastcgi /cgi-bin/php.fcgi)
To keep it simple, if you just copy the setting of the .htacess file in your working site, you should be fine, no matter what server you are on.
Now I can experiment with skins and modules without affecting my live system. I just hide it behind a maintenance screen and no one can see my trial and error mistakes.
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Ken Rich
indiegospel.net
updated by @ken-rich: 07/09/16 09:21:02AM