This looks really cool!

I was just curious about two things - seems there might be some knife aficionados or experts here!

1. Sharpening - As a home cook, who doesn't know a lot about knives/sharpening - how hard would this be to maintain? Would it be plausible to get some basic home sharpening gear, and maintain this myself? Or should I take it to a professional knife sharpener - and if so, how do I even know if they're a good one, and won't damage the blade, or perhaps are good, but somehow get the blade out of "tune" etc?

2. Safety wise - is there anything at all to be concerned about with ultrasonic 40Khz blades? Should I be wearing any hearing protection when using this? (Context - I have hearing loss in both ears, and wear hearing aids - keen to preserve my remaining hearing, and am understandably cautious about this kind of thing for my family and me).