i would say anything that you know you have to give up post op start working on it now. for me soda was a big one. i gave it up in october and was sleeved in december. i have read posts from people who kinda forgot about soda and when they were starting their liquid diets were dying bc they wanted pop. its hard enough to give up food for weeks but to also have to focus on the soda, makes it that much harder. i also started cutting back on sweets and carbs and incorporated a protein drink into my day to sort of prep for surgery.
i also like the previous poster spent hours a night and week reading positive stories, negative stories, stories of complications. i wanted to be as prepared as i could be in case something happened. i wanted to know what my options were if X happened and what the signs and symptom to watch for etc. good luck to you!!!