convert the sandbox site to the live site

I have a site that I am building using a sandbox and now I am ready to go live with this site. I have thought of putting the index.php file in the sandbox folder into the main directory and changing the line for the header.php in the file to point to the one in the wp_sandbox folder from this:

/** Loads the WordPress Environment and Template */
require(‘./wp-blog-header.php’);

to this:

/** Loads the WordPress Environment and Template */
require(‘wp_sandbox/wp-blog-header.php’);

I have yet to do this because I don’ think it will work. What would be a good way to accomplish my goal of turning the site in the wp_sandbox folder in the live site?