Oh ok, well since i'm a guy, i can only suggest what i know from my girlfriend.
She usually does it in her room, usually when she's ready to take a nap actually. She goes in circles with her finger on her clit, and so it get's lubed. Only you know which way suits you best... up and down, rotating...left and right, the level of pressure. (she does it sometimes naked, sometime half clothed, with one leg out of her pants/undies so she can spread) Eventually you will pleasure urself until you orgasm, then it's sweet sailing from there haha
Hope i helped
