Are there any precautions to take when getting fillers during the changing seasons like now?

Lately, while looking into skincare methods, I became interested in filler treatments. However, I feel that I should prioritize safety over just focusing on external changes. I've heard that precautions can vary depending on the injection site and the product, and that there is a possibility of serious complications, though rare. Therefore, I think it is necessary to verify that the medical staff is experienced and to have a thorough consultation regarding the products used, expected side effects, and how to handle emergencies. I also intend to keep in mind that if severe pain, skin discoloration, or visual disturbances occur after the procedure, I should seek medical attention immediately without waiting. It is best to make a decision after doing sufficient research on fillers. For those of you who checked the pre-procedure precautions, what did you consider most important? Please share some information that might be helpful to someone looking into this for the first time.