Preview Your WordPress Theme Before It Goes Live
If you want to test out a WordPress theme before it goes live on your blog, then I’ve found the perfect WordPress plugin for you. It is called Theme Test Drive. It’s very simple to use. Get the plugin from here at the WordPress.org plugin directory, install the plugin, and activate. On your design menu, select the theme you wish to preview from the dropdown menu and enable it.
The theme will be visible to you (the admin) only. Make sure you disable any “cache” plugins before using Theme Test Drive, as it will likely cause problems. Enjoy!