Question!! Do you often get additional procedures after getting fillers?

I'm thinking of getting fillers for the first time, and I'm wondering if it's better to get the amount I want injected all at once, or to get a little bit first and add more later.

I'm worried that if I get greedy and put in too much, it might look unnatural, but if I put in too little, the effect might be lacking.

I'm curious if you usually get the desired dosage from the start, or if you increase it as you go along! Please share your experience :)