It's not the paper piecing part that is more challenging, it's that a lot of the completed peices have curves you have to sew together. If you are comfortable sewing curved peices together, then I don't think it would be a problem.
I've done a lot of garment construction, so I pretty much ignore the directions and put the curves together like I would if sewing on a sleeve, or something like that. In fact, I'm ignoring most of the directions as I thought it had way too much fabric waste for what you end up with. And when I got to that point, I decided to forgo doing it paper pieced too. I'm doing it like paper piecing, just not sewing on the papers.
I'm currently working on two versions of the Fire Island Hosta pattern. Just have the second half of the sawtooth leaf to put together and then it's just sewing the larger pieces (and all the curves) together. I'm not doing the larger version with the pieced scalloped border.
