I would like to inquire about lip filler treatment.

Hello. I am concerned because I often hear that my impression looks somewhat cold due to my thin and weak lips, so I am considering lip fillers.
I've tried drawing over-lips with makeup but there are limits, so I've finally decided to take the plunge and seriously look into lip filler procedures. However, since there is no one around me who has experience with this, I am posting this question on the community.
My biggest concern is that my upper lip is generally too thin compared to my lower lip, and there is a slight asymmetry when I smile. I am wondering if it is possible to correct this by making my lips naturally fuller and symmetrical using only lip fillers.
I am very scared of bruising, swelling, and side effects because I'm afraid it might end up looking like artificially protruding lips.
I am also curious about when I can resume my daily activities after the procedure, and how many days the swelling and bruising typically last. If I plan to go to work or schedule an appointment, how many days should I get the procedure at least to be safe?
I would also like to know if there is a specific type of filler—between domestic and imported—that is more recommended for areas with a lot of movement, such as the lips, in terms of duration of effect or foreign body sensation.
I have heard that because the skin on the lips is thin and sensitive, the filler may shift upward or clump over time. Are there any precautions or care tips after the procedure to prevent this?