Where should I start looking into acne scar treatment?

My acne has decreased significantly compared to before, but now the remaining scars are the problem. I regret not managing my skin properly when my acne was at its worst. I have some pitted marks on my cheeks, and since my skin surface isn't smooth, they don't get covered even with makeup. It feels like I get more stressed about scars than acne these days. Does the treatment method for acne scars vary significantly depending on the shape of the scar? It doesn't seem like pitted scars and red marks are managed using the same method, but I'm not entirely sure. I've heard that acne scar treatment requires multiple sessions, so I'm also worried about the cost. I'd like to know the recommended number of sessions and the interval between treatments. My skin is on the sensitive side, so I'm also concerned about the recovery period. For those of you who have received acne scar treatment, what did you consider most important during your initial consultation? Please share your honest experiences.