How can you put the head on incorrectly? It fits in the handle one way... Then you can use both edges of the razor blade, alternating with each stroke. I'm pretty sure the blades can be used both sides out of the packet too (i.e. it doesn't need to be font face up or down in the razor).
If you see when he is setting it up, the piece which holds the blade in place can be grooves up or grooves down. I'd used it grooves down by mistake.
Just had a shave with it the correct way and it was incredible. Much less irritation, a closer shave and the Taylor's stuff is amazing. My styptic pencil had a bit of use too

Definitely a convert.