The best way to relate to the controls when learning to fly inverted, is to think of Top Control and Bottom Control, not down and up. No matter what the orientation of the model, top and bottom are the same. The handle is the same also, it has a bottom and a top. The rest is strictly practice, and holding your hand in a manor that is comfortable for you. It helps to have an "expendable" model to learn on, and do your flying in that mythical field of tall grass to cushion your mistakes. With proper help, devote an entire day or evening to the ndeavor and you'll have it mastered.
Good luck and have fun.
Type at you later,
Dan McEntee