On here, we generally refer to that as the blade edge edit or knife edge.
You are correct, there is not a lot of information, video or guides on how to install there.
One of the community members @Zktat2s recently had a blade installed and has recorded it.
With close access to his piercer and the fact that he already has a video of the procedure, it would be great if @Zktat2s could put together a guide for the community 
Hint hint.
I haven’t had mine done, as I am saving the blade for the Vivokey Flex One, If there is nothing available by then, I will do my best to put something together.
If only I had the experience or some video, or some photos or knew a piercer