I stopped by somewhere else first and then went to Coco second, and they started by taking a CT scan, which made me trust them.
Also, the director understood the structure of my nose and correctly identified that my nose is smaller and softer than other people's, so he clearly said that they should not touch the septal cartilage.
(He said that if they do, there is a high chance it will collapse.)
He put his hand inside my nose with a vinyl glove and felt around the bones, and explained everything properly and kindly. I was very satisfied with the consultation.
But the manager wanted me to put down a deposit right away, which made me feel pressured. T_T So I said I would think about it more and came back home.
Still, if I do get surgery, Coco is the most likely place. I do not trust the other places much, since most of them say they use silicone and septal cartilage. T_T