Hi, I have no experience of mixed insulin, so it is definitely best to talk to your diabetes team for advice.
Something which really helped me when I was diagnosed was hearing these few repeated messages:
- routines/habits etc might initially change while you're getting used to how your body reacts to insulin/different foods/hormones/exercise/illness etc etc etc
- after the initial period of getting used to the condition, type 1 diabetes shouldn't restrict you in how you want to lead your life.
Namely (for me) I was initially put on fixed doses and told what I should eat. It was hugely different from what I had eaten before and often really didn't match my appetite. The take home message was always that this was only temporary. I was (and still am) on a basal-bolus insulin regime, so once I'd gained confidence with the condition, there was no reason why I couldn't eat or drink what I wanted, when I wanted.
Definitely talk to your diabetes team, but mine were very good in repeatedly asking me if I was doing things differently after I'd been diagnosed, and if so why? They were very keen to try and get me back to my usual way of life pre diabetes, with the diabetes management just slotting in. It will take time, but I found it useful to know that lots of changes were temporary.