The video keeps stressing the need for accuracy. I suppose it would be a good thing to practice on, to get more accurate. At the moment I feel I could be accurate to the nearest half yard, so I need to raise my game.
Finding this actually could be a good thing. I can get copies of the picture above dotted strategically around the place, including on the computer, but I can't start it until I've cleared my outstanding projects. It may take some time, but it has to be worth a go.