Is a MD/Doc of Med. & Brd Certified in Fam Med doing Botox on the side a good choice for Botox? Or is a plastic surgeon better?

First Botox apt next week for my forehead lines. Terrified of a droopy eye or brow. So many doctors to choose from. Is a MD/Doc of Med. & Brd Certified in Fam Med doing Botox on the side a good choice for Botox? Or is a plastic surgeon better? Needing some good advice how to avoid droopy brow or eye. Also, Specific Pre&post Botox instructions from doctors and patience wld help.