Well. First, I get anti-dandruff shampoo in my hair, then I wash my body, starting with my chest. Once I've gotten my whole body washed, then I rinse out the dandruff shampoo and put in regular shampoo. After I rinse that out, I use conditioner, then finally, I wash my face. (If I need to shave, I do that after washing my body, but before getting to my face.) After I've washed my face, I rinse out the conditioner.
I can't bring myself to wash my hair first, -then- wash my body because then my hair would get all soapy. (My hair reaches mid-thigh.)