Think he'll ever be okay with it?

[Ragoczy]

To your guy specifically: find a group to learn from (this place for instance) try to find someome to talk to (tho Doms are notoriously tight-lipped for some odd reason)
and most of all... if you are doing it just for her and not because it really is inside of you.. well that's not a good enough reason

To you specifically: try to get him to talk. If not to you, then someone else who understand what it is that we do. Be very very supportive. If he likes to read, buy him a couple books. Send links, tell stories, try to explain what this all does for you as a person and how this lifestyle completes you

I'll jump in again and second this.

Someone for him to talk to, both about the physical aspects and the psychological, is important.