If switching is something you both want to continue as a dynamic in the relationship, by all means "show him how it's done." Otherwise, I would strongly advise against it. Once you take the reins, even if he begins acting more "Domly," you have made him conform to your standards and you are the one dictating the terms of the D/s dynamic. That rather kills the point, I would think?

Perhaps not, perhaps just having him go through the motions is enough to scratch your itch - but I know, for me, that the pleasurable mental space of being a sub would be compromised if I had to dom my Dom into domming me. (Wow, that last sentence just made me a little dizzy.)

I like Rag's idea of a mentor - perhaps encouraging your Dom to join the site here and select one of his own wouldn't be a bad idea. Who knows, by reading in the forums he may come around of his own accord as he reads and participates in the discussions?