I think this is one of the best things a simulator can help you with, even if its the Free version of FMS. You might look into one...
When it's coming towards you, you move the stick towards the wing you want to raise. If your flying and the airplane is banking left, with the left wing down... (facing the airplane) you move the stick towards the wing that is down or right.
Nothing beats practice and before long you won't even have to think about it... it'll come as natural as wanting to give that guy the middle finger after he cuts you off on the interstate.