I have been slowly amassing my gear and practicing techniques for modifying pocket knives for a few years now. I have at this point gotten acid washing, stone washing, action tuning (even ceramic bearings and phosphor bronze washers), and sharpening down to a science and I have begun titanium anodizing (this is recent and I'm not ready to work on other people's titanium just yet, but soon, very soon). Here are a few examples of my work -

https://photos.app.goo.gl/24zrA8CJxyb7Iwzl1

https://photos.app.goo.gl/J5vUrivV0flYEAbU2

https://photos.app.goo.gl/eavJrx4jYlin9T972

https://photos.app.goo.gl/G4IGsBrQOFmF7Q7F3

I sharpen knives as well (working on a granton for a local chef presently).