I try to embrace the difficult and daunting ... and I'm slowly working through various techniques. Have not tackled piecing circles yet but not for the reason you imagine. My background is in garment making so I've sewn many a set in sleeve. My problem is that I don't buy patterns or templates - prefer to figure things out on my own. I am just not sure if to get a proper circle if the outside curve and inside curve are the same. I just need to work out the geometry.