We are creatures of habit and usually do our bedding on a Monday..
and today for the first time we have put on the clean duvet cover by rolling up the duvet in the cover and it works.
First turn cover inside out
Lay it flat on the bed
Place duvet on top with the opening at the bottom of the bed.
Roll both together from the top
Then at the opening push the duvet inside each corner of the cover
Unroll and do up fastenings and flick and voila it is done.
There are loads of you tube demos of this, take a look.
It is really very easy
Why didn't I know this years ago when with 4 children I was all morning changing the beds.
Try this method and see for yourself.