When you said guided, I was picturing the rooms full of people, sitting in circles, with a leader doing a similar thing. That I don't like at all. It never fails that someone has the sniffles or a cold that causes them to cough. Or even just fidgeting around as they can't relax entirely.
I had honestly never thought about looking for videos online, though. That would make it a lot easier to clear the room of sounds, but still benefit from a guided visual.