lip flip works sometimes, but sometimes doesn't. I've tried it myself four times, and sometimes I get good results, but sometimes they are very subtle. It depends on the anatomy of the lip itself and how strong the muscles are
It's normal to be nervous before this procedure. I' ve tried it and was very satisfied. Botox lip flip treatment does not provide any lip augmentation. It is just a visual effect, which is very natural and subtle. You can read this article https://dkderma.com/blog/botox-lip-flip-what-is-it-and-where-to-inject/ to know more.