I can drive a stick shift, but haven't driven one in years!!
As for how one can learn, like another poster said, can go to YouTube, but the best way is to get a hold of one and start driving it! Go to a big parking lot or open area or open road and drive via trial & error. Maybe even better to have someone present who already know how to drive one, so they can give instructions as well as a demonstration on how to drive a stick...