A method and system of conditioning human skin and hair using a hand-held skinhair conditioner having interchangeable interface conductors that are contoured to enhance electrical conductivity between the conditioner and a variety of body areas. The method includes the steps of providing a first mechanism on the carriage assembly for making small distance changes between the rotary cutter and the work surface and providing a second mechanism on the carriage assembly for making larger distance changes between the rotary cutter and the work surface. Each of the neighboring joint terminals includes a wire-crimping portion, a terminal body housed in a terminal chamber among the plurality of terminal chambers, and a pair of first and second contact portions, respectively.