This probably doesn't belong in a razor forum since it's a knife question, but this is the only place I know of where there is a plentiful supply of honing gurus who give reliably good information.

In Murray Carter's videos, is he holding the angle of the knife freehand? Or do Carter knives have a large bevel that serves as an angle guide when laid flat, as Swedish Mora knives do?

I ask because I am unable to hold the knife the way he does. When I try, I rock the spine subtly while honing, thus (severely) convexing the bevel. I do a much better job when I hold the knife in one hand with my index finger on the blade for stability, and describe circles on the hone. I'm not perfect, you can't shave with my knives the way Murray does, but you can cut tomato slices thin enough to see through, so they're sharp enough for all practical purposes.

Note: I don't own any Carter knives, nor have I ever seen one up close. My knives are very old carbon steel Chicago Cutlery.