I'm curious about hairline procedures.

I don't have a lot of hair, but since my forehead is relatively wide, I sometimes suspect hair loss. Also, there is a possibility of genetic hair loss. So, I was curious about hair loss treatments, and lately I've seen a lot of advertisements for hairline procedures. I'm wondering what the hairline procedure is like, and if it hurts. There are various shapes for the hairline, and I want to know if I can choose the one I like. I’m also curious if you can recommend a style that suits me. It seems like it’s not a one-time thing and needs to be done multiple times, so I wonder how many sessions are ideal. I’d like to know if you are satisfied with the hairline procedure.