I was mostly concerned with how you would go about getting the pressure on quickly, if it was needed. Also, after it's tightened, does position matter? Like, would it still work if i were laying on my side?
Only position that will matter is that of the cornhole bags or whatever you're using for the padding.
Like I said above too, you do not need to apply a lot of pressure just like it's stated in the video above.
Your "Sweet Spot" is the spot where you can put the padding on that doesn't crush your windpipe at all. When you're applying pressure to the arteries and then just tighten it a little more. As I said above, you might feel a little of "Expanding head" syndrome, but if done completely correctly, it will only happen slightly.
If it's almost unbearable then you might want to loosen it up just a little. It doesn't need to be a sudden tightening like you would feel with a noose or anything like that. This is just applying it to around the neck, slightly making it tight without any need of doing it fast, and then sitting down and relaxing.
Laying down also works too as long as you positioned your padding correctly.