You sound scared to me.
yea i would have to agree and that is a professinal doin it and im sure them rays have had it done since they were tiny
Yes, usually water q is perfect on major systems like that. Also, 99% of zoos/aquariums in the US use MS 222 (or something similar) to knwock the animals down prior to the trimming of the barb. They are recovered and set back to the display/exhibit. The animals are very acustom to being handled by their keepers.
I have done it, but like to stay away from it as much as possible. I equate it to pulling the teeth out of tigers so they don't bite. Not really a big fan of removing parts of animals.