This takes two people but it's a good method.
Turn duvet cover inside out. Stand on bed....without shoes

....stick your hands inside duvet covet and grasp the corners of the duvet cover and the duvet. Get the other person to gently pull the duvet cover down over the duvet and hey presto it's on. Button up and shake. No empty corners.
Is that as clear as mud or did anyone get it

Honeyb
x