Only people that i have met better than I are Jude, Jon, and Jeremy. And each has had a sacrificial knife where they have thinned too much, sharpened too acute, and generally ruined a knife to know what to look out for and to get the most out of their knives. I have not ruined a knife yet, soon, soon though.
Fun thought, Some sharpening markers or "check points" you need to experience.
*Double edged knife Edition*
0. Understanding that sharpening/ polishing is a removal process.
1. Make a truely sharp edge, Micro-bevel allowed, (insert cutting paper test)
2. Create a perfectly even bevel on both sides. (able to hold constant angle, understanding Burrs)
3. Make a exceptionally sharp edge with no mico-bevel. (insert bob kramer round magazine paper cut test // Cutting paper towel) ( able to hold very acute angle, able to "touch up a knife" on finishing stone easily)
4.Thin a knife, make it better then what it was by a significant margin while keeping its original proportions. Polish it to a mirror (compounds allowed) / Level 4.5 polish with Finger stones
5. Fix something Damaged on your knife, wonky steering issues, Tip, Grind problems, etc. (knife assessment and knowledge to enhance properly)
6. Create a fantastically even finish on both sides of a wide bevel (beta Togi)
7. Fix steel road on wide bevel so its straight no waves. (see Kiriba / Shinogi Line) & polish Hamaguri edge so its even through out the blade.
8. Make Finger stones/ polish Japanese style (3 ways) / Slice a pig in one swipe.
9. Able to do ALL the above.
10. Able to ALL the above blind-folded, on touch alone.