5-10 working days turned out to be more like 20.

They didn't seem overly difficult to install but they came with no instructions whatsoever. I had a question on this which I was told on the phone to email to their address, my email wasn't responded to.

It took me a while to figure out why they look a bit wonky on the window, it's actually because the bottom of the blind isn't straight, they've looped it around the bar at the bottom and sown it but the looped but is measurably longer on one side.