Shortly after my wife and I started exploring swinging, a man said to me - "If I can watch my wife suck another man's dick, I can talk to her about anything." As we were both watching her do just that, I believed him.
It has been my experience that, in order for a couple to be successful swingers, you need to be able to speak, openly and honestly, about anything. You need to trust her and she needs to trust you, completely.
So, that is my suggestion, even more to you in your society than to another... show her she can trust completely. Show her you trust her completely. Show her that you can talk to her about anything... your fears, your concerns, your deepest most hidden desires. Show her that she can share the same with you... without fear of judgement or punishment. Trust each other completely. Communicate openly and honestly. Then, you can begin to explore swinging.