Business skills. Skincare specialists who run their own salon must understand business principles, such as accounting, to manage a salon efficiently and profitably. "The amazing colorist Nikki Lee at 901 Salon in West Hollywood took me from brunette to blonde fairly recently and it took around 10 hours to do it properly, but it was worth the work." But, even a perfect dye job needs some maintenance- she uses Olaplex’s No.3 Hair Perfector ($28) along with a handful of hair-perfecting vitamins…