Is it okay to get lower face Botox in multiple places at once? Since it's my first time, would it be better to do them one by one?

As I was looking into Botox, I realized there wasn't just one thing bothering me lol.
I am a little self-conscious about my square jaw, and I also notice how it looks bumpy when I tense my chin, and how the corners of my mouth look slightly downturned when I have a neutral expression.
But getting lower face Botox in multiple places all at once from the start is a bit of a burden for me.
Since the location or role would be different for each place, if I were to work on multiple locations at once, I don't think I would even know what aspects I was satisfied with.
Do people usually start with the one or two places they are most concerned about for the first time?
Alternatively, I am wondering if there are cases where it is more natural to assess the overall movement of the lower jaw during the consultation and treat the necessary areas together.
I don't want my face to look drastically different, so I want to keep it as conservative as possible at first, haha.
For example, is it possible to get square jaw Botox first, see the results a few weeks later, and then consider additional treatments for the chin or corners of the mouth?
On the other hand, I'm concerned that if I get multiple procedures done on the same day, the changes might settle all at once, resulting in a more naturally refined lower face.
I am also curious if the timing of the effects can vary depending on the area.
For me, it is most important to keep my original facial expression intact, especially when I smile or speak.
So, when I have the consultation, should I ask them to examine my lower face as a whole, but specifically ask for recommendations only for the parts that are absolutely necessary?
Are there any of you who are new to Botox and, like me, were worried about various things and hesitated about which areas to treat?
I am curious whether you tried just one initially and then added more, or if you received treatment at several places together after the consultation.