Dear all, so sorry it seems I have ignored all your comments but I did read them at the time and considered some of them to be possibles. However, several medical problems have intervened and by now we have been on our next site and seem to have found an easier solution which might not work for all.
I imagined that at 5 foot 3 I would need a step stool to read the awning rail but in fact I found I could JUST reach it from the van step with the aid of a second step with a tall handrail for stability. I found said step at the back of the garage, bought for some reason years ago and never used.
I learnt that the RHS front upright pole needed to be used (but not the roof pole) to raise the awning roof otherwise the clamp was "clamped" to the van wall and was immoveable. Using the front pole meant it was loose enough for me to be just about able to (safely) get it over the exterior light (standing on said step).
Of course I then had to remember to leave the upright pole in place when dismantling as well. In fact it was all a doddle.
I see the benefit of the pulley system but in fact without the front window zipped in the awning is not that heavy to pull through the channel. I tried the lubricant idea but couldn't get it to spray inside the channel!!
Anyway, thanks a lot everyone.
Meg