Would it be okay if I tried it once and then decided whether to continue?

I am very interested in skincare, but paying multiple times right from the start is a bit of a burden.

I am also looking into Rejuran, but seeing that it requires multiple treatments, I was wondering if it is difficult to judge based on the first procedure alone.

I would like to know if I can determine the next plan after receiving the treatment once and checking for any skin reactions or changes. For those starting for the first time, did you decide on the total number of sessions from the beginning, or did you decide based on the progress?