Here's my advice. See a sex therapist, particularly one who isn't threatened by swinging and can guide you without judgment.
The reason I say this is my wife and I have had several issues come up about swinging and having a third party present in our discussions was very helpful for our communication. We explored lots of things (i.e., why I was so interested in it, why my wife was resistant, ways to talk about it without it ending up in arguments). Ultimately, we ended up trying it for a couple of years, backing out for a couple more and now we're talking about getting involved again. Our therapist helped guide us through those transitions by helping us learn to respect each other more and how to honestly hear what the other person is saying. The process made us so much healthier and we're looking forward to trying things out again but from a more enlightened perspective.
I agree with everyone who says that you shouldn't rush it and that things take time. People's ideas and opinions change and if you can keep a healthy dialog going about it then you'll both probably be able to get at least some aspect of what you want. If you rush it then that will inevitably lead to resentment and that can take years to recover from and set you both even farther back!