Ok. My thin, fragile hair has had enough. I have gone full-hippy (as DH calls it) and bought a block of Caca Rouge from Lush.
I like this more now I have found out it literally means "red shit" 
After watching every single video I can find, I am excited to be a flame-haired Merida type, but less excited at the UNHOLY MESS everyone seems to make.
I am thinking, as I have chin-length baby-fine hair, can I do this upside-down over the bath to avoid destroying my bathroom? If I fill a bowl and then just sort of dunk and scrub until it's all in? We're about to put the house on the market so if I can avoid dying the bathroom orange, that would be ideal.
Or is newspaper/a tarp/the garden my only option?
Help!