You say in the video how you expect the viewer to have already done the lab.
You are supposed to get it working on your own.
The learning gap is far too wide to be able to pull this off on your own with the literally 1 example of each topic covered.
I highly doubt the author managed to pull this off in on shot on his first go-around either.
Personally I manage to get about 70% of the way there.
But these types of labs I saw plenty of in my engineering studies at university and my answer is always the same.
How do you gap from A to D when you don’t provide stepping stones to get from A to B, to be comfortable enough to make the jump again to C to then have the Confidence to get to D?