I thought it was really easy, just sew a little slower. I cut mine out in squares of fabric then marked the curved line and cut on that. It only took 2 pins at the sew line the one in the center and the half way point at the leading side. (guess that would actually be the 1/4 point) to make sure the square points stay centered. I'll try and make a photo tutorial in the next few days and post it.
I set my curve a little different then most drunkards path b/c I didn't want the corner in the block like most have. I wanted the curved flow w/o the right angle to throw it off b/c of the design I was making.
I know that MS lady thinks her way is easier, but for me, heat and bond has never worked and applique is not my friend.
This is how it is traditionally done see the right angles forming the inner square??? That is what I didn't want when I made my pattern I set the curved line to avoid that.
I think she uses light weight interfacing to turn the circle not heat and bond. I know a method to sew it on using just two pieces but I do not know any where online that it is shown that way. I learned from the people that I bought the templates from at a show.