You should be able to adjust it (tweak it) yourself for the particular environment you’re in.
If certain frequencies are coming in too loud you lower them, if too low you raise them.
You don’t need an audiologist.
My hearing aids are almost 8 years old. They are programmed for quiet or noisy environments and I can switch between those two settings. I can also adjust the sensitivity, the sound volume by six decibels in either direction.
I have no desire to sit in a restaurant and play with dozens of different frequencies in my hearing aids when the reality is my discrimination is so bad it doesn’t help much anyway