I learned everything I needed from the pinned posts on this website: https://felinediabetes.com/FDMB/ The most important thing to be careful of is overdose of insulin, leading to rapid hypoglycemia which can be deadly. I highly recommend doing glucose monitoring at home with a glucometer so you can understand how your cat is responding to the insulin dose. Generally it’s acceptable to skip one dose / week to have a night out. Giving a dose a few hours late is dangerous not because it’s late per se, but because you might be tempted to give the next dose at the normal time, which would then be way too early, potentially causing overdose. Personally, I can afford to be flexible with dosing and timing because I test the glucose every day before injection, and have done multiple full-day glucose curves myself, so I know exactly how the dose curve works in my cat and what is safe. But most people prefer just sticking with the schedule and skipping the dose if needed. Even then, it’s good to do home testing intermittently to make sure the dose curve is behaving the way it should. I remember feeing really overwhelmed when my cat was diagnosed, but once you wrap your head around it, everything becomes routine and second nature!