Has anyone used an Obsfucator, such as ProGuard with MIDlet Pascal?

I'm really struggling to understand what I need to do to obfuscate a .jar file...

Created a 'Hello World' application, and even tried a MIDlet that was created with a 'proper' Java IDE...but can't seem to comprehend how it all works...

I can list the errors if necessary if anyone is familiar with using such a thing...

Thanks in advance,