I haven't used Curl with a proxy, but it looks pretty straight forward: http://www.php.net/manual/en/function.curl-setopt.php
Look for "proxy". You may have to write some code that identifies which server its running off of. When its on your home machine, it'll need to use the proxy code, and ignore the code when its running from your production server.
Otherwise, you may have to create libraries. One library for production which doesn't use a proxy and another library for home which does use a proxy (use include() or classes).