I'm working on a JN pattern right now, and it's the first one I've done with curved piecing. I've never done any curved piecing, in fact. However - IT'S NOT HARD!!! You don't actually paper piece the curved seams. Instead you paper piece each side of the curve, take the paper off the piece on the outside of the curve, and sew the two together. I use lots and lots of pins, but some people are able to do the sewing with just one pin at each end (at least I've heard that). I will take some pictures of what I'm doing and post them later (probably tomorrow) if you think that would help.