I rooted and was able to get Jelly Bean on my wifes old Fascinate. I got the steps to do in the Phandroid Forum. There was a link to XDA that has instructions for installing other ROMs. I have a question -can I download any of the ones listed (like JellyBro, Paranoid Android JB or Baked Blackbean) and place them onto my SD card and easily switch back and forth just by booting into recovery and selecting which ever one I want? Is it more complicated than that?

Thanks