I've been on Novomix 30 for almost a year now and it can take a while to get good control, but it's certainly not impossible. Unfortunately hypos are a part of that and as iHs says, you need to really think about how it's going to affect you in 1 hour, 3 hours etc... For instance, I found myself taking larger doses of insulin (~18 before breakfast, ~14 before dinner) and then snacking a little bit because to take enough to deal with the peak also means I'll be topped up with basal for a long time! Thus is the curse of premix - but I only have to inject twice a day
An example of my average day is:
18 units before a slightly carby ( :? ) breakfast - cereal and toast.
Usually have a snack at around 11am - roughly 15 carbs.
A salad for lunch.
14 units before a restricted carb, low GI evening meal.
Slice of toast and/or a bit of cheese before bed (11pm).
This is pretty much my routine and BGs are under control. Very few hypos and, more importantly for me, very few peaks.