I suppose it would matter what kind of bedding was used. We use a fitted queen bottom sheet, a flat queen top sheet and a light comforter. The top sheet and comforter are not tucked in at the foot end as we prefer it that way.
The head bed-maker tells me that she puts the head of the fitted bottom sheet on the mattress when the slide is in; then, the runs the slide out and pulls the foot end over the mattress. The top sheet and comforter are put in place without tucking in the foot and the slide is brought back in, folding everything in the process.
We have found that raising the window shades prior to bringing the slide in prevents the bedding from catching on them.