Thank you. You are wonderful people.
Lynn, the secret is the hanging pot you can just see in the bottom of the second photo. It has been placed there to set the extension of the sedum into that area.
I place the pot where I want the sedum to grow and it grows down the side of the pot and set roots when it reaches the garden soil, stones or mulch. When it is set, I then cut around the bottom of the lip of the pot and lift it up leaving the sedum outside the pot behind. I cover exposed stems with soil, mulch or leaf litter.
The photos that follow are of the area I just set at the top (other end) of the sedum. It looks scrappy but that will cover over quite quickly because these cuttings are set and rotted. I weed the sedum because other more aggressive groundcovers like native lobelias and violets will take it over. Sedum breaks easy when weeding but it will soon recover. The broken bits you can try and set.
I have to wear my glasses and I just use fingers and tweezers for pulling and a small paintbrush for applying weed killer (mostly against White Root).
It helps me with the area being raised above ground along my driveway and I can sit and work on the wall in a relaxed way. No one is more surprised than me that the sedum has worked out so well and I only discovered how to spread it successful because I slothfully left a hanging pot on the ground there. It has been quite a rewarding endeavour with a splendid aesthetic result. This is my second year working it.
This is the mother hanging pot.
This is where it last was successfully.
This is the result. Which will cover over soon.
This is White Root, an aggressive native ground cover that smothers everything given half-a-chance.
When this flowers, it becomes intensely yellow and is all quite beautiful and bee-loved.
I'll have to star it so I don't forget it again. 
