If it is my first time getting Botox, would it be better to start with one area?

I've started to get self-conscious about my frown lines, so I'm looking into Botox for the first time.

However, since there are many cases where the forehead or the space between the eyebrows is treated together,
I'm wondering if it's okay to treat multiple areas right from the start.

Rather than eliminating wrinkles as much as possible
It is more important to keep your facial expressions natural.

For those receiving the procedure for the first time, did they start with just one area?
I would appreciate it if you could share your experience regarding whether you treated multiple body parts together.