How do you schedule your square jaw Botox injections?

I feel like the lower part of my face looks a bit angular, so I am looking into cosmetic procedures. I didn't really care about it before, but recently, my jawline has been catching my eye even in frontal photos. I am looking into square jaw Botox, but I am having trouble deciding because the reviews are more varied than I expected. Some people say the lines became naturally defined, while others say you need multiple sessions to be satisfied. I prefer a natural-looking maintenance rather than a drastic change. I am curious about the typical treatment frequency and whether the dosage is important for the first session. If anyone has received square jaw Botox, please let me know about your satisfaction level, the cost, and any discomfort you experienced after the procedure. Since this is my first time, I am researching various options, but it is harder to make a decision than I thought.