How many sessions of acne scar treatment would it take to determine if it is effective?

I tend to want to see results quickly, so this time I'm planning to mentally prepare myself before starting, haha. Since acne scar treatment is about improving old scars, I don't think I should expect immediate changes after just one session.

Still, I'm wondering how many times I need to try it to determine if it suits me.

Is the first session of acne scar treatment primarily intended to check the skin's reaction, while actual changes tend to accumulate over several sessions?

I’m not aiming for perfectly smooth skin. I think I would consider it a success if the contours are just a little smoother than before and the shadows are less visible when I wear makeup, haha.

So, I think I could keep at it if I kept seeing even very small changes, but I'm wondering if it's a common process to see almost no difference during the first two or three times.

Even if a rough recommendation is given during the acne scar treatment consultation, are the sessions adjusted midway based on skin reaction or changes?

I think it would be more comfortable for me to try about 3 sessions, compare the photos, and then make a plan for the next step, rather than thinking long-term like 10 sessions from the start.

I plan to take photos under the same lighting before starting and keep a record about once a month. Would this help me view the effects a bit more objectively?

For those of you who have received acne scar treatment multiple times, at which session did you first feel, "Wow, this really makes a difference"?

I am also curious if the number of sessions you were actually satisfied with was similar to the recommended number. If I start knowing that the effects appear slowly, I think I won't get impatient and give up halfway through, haha. Please share some realistic experiences~~