The following worked for me.
You need to lay the skirt out on the ground next to the van.
In line with where the rear of the van kicks up make a cut across the cord part of the skirt. You may want to cut a 10mm long piece out of the cord.
Lift the skirt up of the floor and start feeding it into track from the centre of the van near the wheel arch, feeding it towards both the front and back of the van.
Do not feed the odd 300mm or so where you have made the cut into the track, just let it flop around and then clip it to the awning with a clothes peg or similar.
You could punch some holes through the unsupported parts of the skirt and feed suckers into these of the type used on car window blinds for the children in the back. I planned to do this mod but my awning is going back so never got around to it.
Colin