I understand your frustration I also had difficulties when I first learned about Mango and was not familiar with Java and Tomcat. We offer private training and support where we can guide you through the installation process. You can purchase support time by the hour on our new webpage at this link: http://infiniteautomation.com/index.php/services.html
One hour should be enough to get it all installed and how you how to use all the basic feature.