Piece of scrap paper.
Simply screwed / pushed through.
Most of the directional guidance is applied by the screwdriver, paper is just to remove the need to hold the screw upside down etc in roughly the right location whilst you fiddle around with the screwdriver. Of course a pilot hole makes life easier or if that not needed punched with a bradawl to help with the intial "bite"....can sometimes use the paper to guide the screw into position for a light pushfit or 1/4 turn by finger.....on some jobs I find a single
finger works best, rather than being all fingers and thumbs