Three times I've chickened out but yesterday I watched the YouTube video twice and decided to try it in the interests of science. I think it actually took longer than normal what with turning the duvet cover inside out - conveniently ignored in the video - spreading and flattening both it and the duvet to match on the bed, rolling the darn thing, and dashing back and forward round the bed to do 'things' on the other side before unrolling it.
Was it just me and beginner's ham-fistedness? Does it get better?