I'd say it take like an hour to cut myself, instead of like 20 minutes if the blades were new.
Keeping your hair somewhat wet helps a lot in shortening the cutting time.
I use double sided adhesive tape to keep the blades fixed on a really flat surface.
Wetting with water (or possibly oil) makes a huge difference. I guess what happens in the microscopic level is that the tiny rubbed off particles are "flushed" away from the edge. (Otherwise it would be like having loose sand between the blade and the sharpening stone).
I leave the most worn areas (in the corners) (If one were to grind down these areas too I fear I would make the blades too thin in no-time.)
Since the picture was taken I have gotten a diamond sharpener with a grit size of 600 which is much better.
I'm still experimenting on how to do this in a good way. Currently I use a small piece of wood, like an ice-cream stick, which I move through the ribs from the backside towards the edge.
One might do better with some polishing fluid on.
After seeing videos on youtube, I realize that actually having a microscope would be good, so one sees what is actually going on.