Hi,
The plugin functionality is fairly straight forward.
Before you install the plugin, make a note of the JavaScript files in your WordPress head and, once you install and activate the plugin – just check if those JavaScript files are moved towards the footer (in your source code).
If the result is satisfactory, feel free to use the plugin.
On a side note, this plugin does not add any new functionality to your site or theme.
As I find time, I’ll write better documentation – to make things clear.