How do I install Retropie on a Raspberry Pi that already has Raspbian installed?
At the very worst I can use BerryBoot if I need another OS.
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Sign up to join this communityYou can just run the RetroPie setup script and it will install all the dependencies for you.
Or can use berryboot to have a completely separate partition on your SD card.
Or you can just get another SD card and dedicate it to RetroPie.
install rasbian first then log on the desktop using startx and then install retro pi via the desktop consol using this method http://blog.petrockblock.com/2012/07/22/retropie-setup-an-initialization-script-for-retroarch-on-the-raspberry-pi/.
I would suggest the RetroPie setup script. I tried berry boot but had problems accessing the necessary files to modify the config and copy over roms. It also seemed a little slow, but that might have just been me.
Although it can take a while for the setup script to completely run, I'd suggest going that route.