Henry said:For some reason when I think of the idea that anyone can potentially do Rituals, I am reminded of Angel, Wesley, or Giles from the Buffy the Vampire Slayer series -- they performed magical rituals quite frequently, despite not being mages themselves. They broke out the components, candles, books, etc. and read out of a book, which fits the flavor of Rituals perfectly. I'm sure there are other book and movie examples of non-mages doing magic in a similar fashion, but I'm blanking right now.
I always flash to Call of Cthulhu, where even if I am a policeman, I can start a ritual as long as I have the incantations written out and the correct props and prepwork. Thats how I picture the ritual system for my game.