Does 'not halfass' mean that you are amining for a 24/7 D's relationship?

To do it right means finding out what is right for you two. Maybe the first question is how much power does your wife want to give away, and how much do you want to take? Make sure that you are on the same page before you go in with the heavy guns.

Is it all the time, or in the bedroom, or when you are in the mood for this?

Maybe the next one is to find out how to express your power relation. Should it be something with rules and regulations, such as her kneeling when you enter the room, not talking without permission, not sitting in the furniture and so on?

Or is it more physical, does she need to be physically owerpowered? Or first, anyway?

I'd say talk first - a lot.