Changing Body Hair Color

Hi, I'm hoping someone can help me with this or direct me to a good tutorial.  Is there a way to change the color of body hair or at least blend it better so gray hair doesn't stand out so much.  I can change the color of head hair and do touch-ups on gray in head hair, but with body hair, it isn't one big mass of subject to work with, but individual strands.  I haven't been able to figure out how to do this and make it look natural.  I don't need to remove the hair but at least make it not stand out so much.  Thanks for your help.