I was annoyed at first and iirc my ex-GF cut the corners, once I realized the put-hands-inside-edges-of-inverted-cover-and-grab-the-duvet-corners-and-pull-throu

I was annoyed at first and iirc my ex-GF cut the corners, once I realized the put-hands-inside-edges-of-inverted-cover-and-grab-the-duvet-corners-and-pull-through method I've mellowed on them since it goes fairly quickly.