I would like to eventually get a merlin, but I would probably wear gloves with gauntlets and eye protection. I'd think you would have to do a little prep-work without the blade first, just like with clippers, to get the horse accustomed to the noise and feel. There have been threads about this tool in the past and I'd never heard about anyone getting injured. Surely the people who trim their own have horses that will stand very quietly. A farrier has the right of refusal if the horse is unruly. Mine have hooves handled at birth and from there on out. I can't afford not to, I am the only farrier here. Someday I will get one, I'm still fairly young, but the more you abuse your body at an earlier age the earlier the consequences.