I find it by dragging the tip of my fingernail down the edge bevel; it will usually catch before the fingernail slips off of the bevel if there is one. An eye Loupe also helps out a lot; you will see a rough patch if there is a burr there. I was going nuts sharpening a knife until I looked thru the loupe and realized I didn't get all the way to the edge with the first stone and the area was really rough and coarse looking. Went back to the 1200 Beston and made sure to go to the edge.
You are my new hero.
Excellent hand position in pictures number seven and eleven.
I really am related to Tony Clifton.