Yep, definitely mention u have diabetes. I started working in a busy shop full time just recently, about a week ago. I have T1 for about half a year now but i can manage it well enough now so it doesnt give me much headaches during work. I have bfast at home so i only need to bother myself with insulin max 2 times in work. I keep my BG meter close so i can check anytime i dont feel well, usually around 10am it drops so i already know i need some more snacks there. As the day goes on i get more relaxed , more use to the fast pace and im fine with my BG, i can usually find the time between 12-2pm when i can have lunch, insulin and all. Dont be scared, just be sure u always have smt like a candy in ur pocket to raise ur BG fast if it drops, when the cafe is full and u just dont have time to go anywhere it ll be a lifesaver. Make sure u let ur boss know that u need X time to take insulin and then to eat. U ll see when u can run off to do it all when theres not much customers or someone can cover u, but definitely let them know. The rest of ur worktime u can give ur 120% ! (; Good luck for u !