As a circle skirt lover, one thing I have come to realise is really important is waiting for the hem to drop. As circle skirts are made on the bias [*note that this skirt was cut on the cross-wise grain*], the fabric is likely to drop in different areas of the skirt. As such, you should wait before hemming your skirt.
"I started by placing the fabric tightly against my skin (just because) and then I washed and spun the fabric in the machine using a temperature of 30 degrees. Then I left it to completely air dry."