No, PinkCakes, no disability or mobility problems - thanks for asking. I think everyone who's tried this says it is difficult for the first 3 or 4 weeks but if you can stand it, the scalp then starts to adjust, as geekesse says. I do run hot water through it of course, and as it happens, I finish my shower with cold water, but I expect this will only convince everyone that I'm some kind of freak. It might affect my hair - I don't know. My hair today feels soft, not greasy, looks good and as for whether it smells - I live alone so can't be sure, but it's ok for me to live with! It's much less itchy than it used to be, that's certain.