when u shave, leave hair on or take it all of or make a heart it doesnt matter!! same with trimming, just cut it the level u like best. nair suxxxx. soo bad. i used it one my pits. i sat there for seven minutes with my arms up, just enjoying the chemical smell it gives off that resembles sewers, and when i wiped the goo off, the hair seemed to have grown darker as well as thicker, but no shorter. also left me with pain for a while not good!! i would not recommend any chemical hair remover...they are a messy smelly pain!! i personally dont shave down there, i trim. well, i shave in the summer or when i go swimming, but you have to every time you take a shower or else it grows back and makes you itch something horrible! hopeihelped=))