Pony Club blocks are 8" and after working on the FWS 6" blocks ... they seem absolutely huge!
The PC Quilt-A-Long here on the Board only started two weeks ago, so you're really not far behind the group. Besides, I'm sure some will join later on, as I did with the FWS. We've even had some join into the FWS as newbies since Christmas.
The threads once started are there forever, so it really doesn't matter when you start, as those that are further down the trail, are very supportive of the latecomers, as I was, and come back to the threads to show their support and help coach and inspire us ti continue.
Hope that the Pony Club wins out, and that you'll saddle up with us!
(Of course, I'm partial, just a tad!)