comes naturally after a while, and you won't need to think about it, but sometimes I find myself imagining as though each corner of the right stick pulls on a string to that same corner of the quad - eg if I pull the stick down and left, then it will brake the quad as though pulling on a string from its rear-left, and so on.
Strangely enough, I find nose-in hovering slightly easier than nose-out (see avatar pic !)