To prep, I bought heavier-duty rubber gloves than the paper-thin disposable ones Overtone provides, since I had read the dye can still get through them (I saved them, though, for using the daily conditioner). My murder dye prep kit also included a black towel to save my nice towels, hair clips, facial lotion to keep my face dye-free, and trash bags to prevent carpet from getting stained during the process. I highly recommend covering all surfaces you don't want stained (and either doing it naked or in a shirt you don't mind getting stained), and fair warning, the tub will require intense cleaning after you shower (and even then it may still have a hint of colour). This stuff is highly concentrated.