The plugin version of Ben Word's article, http://benword.com/2011/how-to-hide-that-youre-using-wordpress/.
There are no special installation instructions. Install as you would install any other plugin and activate in the plugins menu. There are currently no options to configure after installation. You may want to edit your theme files to point to the root-relative URLs after installation. The root relative URLs are particularly useful for people starting from scratch with new themes.