That video is really good - I liked her Crazy Curves templates so much I accidentally bought two identical sets. Never used either one of them, yet. :)
I used her method with a vintage quilting foot - it has very short toes so you can hold the upper fabric up until just before it comes under the needle. It worked out much better for me than a normal zig-zag foot which has longer toes. You can buy them pretty cheap on eBay if you watch for them.
Once I got the hang of it, I wondered why I had ever been worried about sewing curves. I'd way rather sew curves than those blasted "y" or "x" seams!
The CurveMaster foot worked even better because it has a guide on the right side of the foot to keep your 1/4" seams even - your fabric can't wander out past the guide. A normal sewing foot doesn't have this, so you're having to keep the fabrics separated, but keep the edges rolled in to meet AND keep your seam allowance at 1/4" by eye, all at the same time! I'm really not that coordinated! :mrgreen: