Installing/Setting themes information very confusing

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http://askubuntu.com – I'm finding very conflicting/confusing info about how to install and change desktop themes with Unity. Where to extract files, which program to use to change themes, etc. I'm new to ubuntu and using 12.10. All my web searches have proven this to be more difficult than anticipated. Is there a web page with straight forward information and examples of how to do this? (HowTos)