For S&G, I downloaded the Kubuntu .iso (currently using Ubuntu Precise Pangolin). I would like to give KDE a whirl.

Is it better to install using the image on USB or use apt-get?
Is there anything I should remove from the Ubuntu install prior to doing this to prevent things from "breaking"?
and if I do this, I know others do quite often, how do I keep installs clean?

My /home is in a seperate partition so, in theory, I shouldn't lose data.

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