Here at R29, we're of the opinion that there are no real mistakes when it comes to beauty. It's all good all the time. If it doesn't work for you, then just wash it off and try again next time. Mistakes are for spelling or division — not for beauty.
That said, there are some bad habits we can develop within our regimens. These no-no's run the gamut — from missing a step in our routine to being hard on ourselves about a particular haircut. They say an unexamined life is not worth living — shouldn't that count for your beauty routine as well?