My major problem is uploading images on my testserver.
The issue is setting the /tmp dir and open_basedir in php.ini.
You don't want to change those settings in php.ini, as settings there will apply to all PHP programs. You want to set them in the section of httpd.conf specific to the Joomla installation. If you are using an i-bay, then the database setting in the post you referenced will do that.