Well, you are already on your way if you have the sails already.
As I said before I just tried out the spin for the first time on Saturday. Let me tell you it really adds something to the boat. The wind was very light and normally the boat would have been a dog downwind. But when I pulled that spin up it took off.

Are you going with a snuffer system?

Once you go cat you never go back! Nacra 5.2 (Elsies)#1499, running an inter17 spin!