Is left right or is right left!!!
I agree wholeheartedly about the sims helping. I know they did it for me.
To help keep my sense of left and right straight, I painted teh wingtips of my trainer red and green, respectively. Now I don't think about left and right, if I want to turn to the red side, I know that's left and vice versa for green just like on a boat or full scale plane.
Use the most brilliant flourescent colors you can find and you'll always have a visual cue as to which wing is which.
Ed