Trapezius muscle Botox side effect: stiffness

As the weather gets warmer, I want to wear off-shoulder or low-cut tops nicely, but I have a huge complex about my prominent trapezius muscles.
My friends have told me that trapezius Botox is the surefire solution for this kind of situation, so I am seriously considering taking this opportunity to visit a dermatologist for a consultation.

However, I am a little scared because I heard that since the Botox injected into the shoulder works by temporarily contracting the muscles, it is difficult to lift my arm high after the procedure.
I heard that people whose jobs require them to lift heavy objects or use their arms extensively may experience significant discomfort in their daily lives for a few days due to the side effects of Botox.

After reading reviews about the side effects of Botox, such as a stiff and heavy feeling in the back of the neck that lasts for a week even when at rest, I am hesitant to make the payment.
If any Maypure members have tried getting Botox to tighten their raised shoulder lines in preparation for the upcoming summer, please share your honest and real experiences.

I am very curious about how many days it usually takes for the muscle stiffness or soreness from Botox side effects to completely disappear and for the shoulder line to drop smoothly and straight down at a right angle.
If the results are good, I am willing to endure a little soreness, so I would be grateful if you could freely share any helpful tips on what to be careful of before and after the procedure in the comments.