Hi, I am classified by my hospital as T1 but believe I am in fact somewhere in between 1 and 2 so feel slightly able to answer your question, with the understanding I am not trained, just went through this as a T2 on insulin.
It’s all about finding your insulin ratio, for example, if I ate a meal of one large potatoe at 64 grams of carb, and my ration was 1 to 1, I would need to inject 64 units, if 5 to 1, 32 units, 10 to 1, 6.4 units (or rounded to 7).
So all you gotta do is work out what your ratio is by trial and error, this might mean eating the same meal or meals until you figure it out.
Now if that sounds easy, it’s just not! Really really not lol, if you eat butter on your potatoe the carbs are slower, if you have a virus brewing, even one you will never know you have, if you are menstrating (be hard for me lol) if the wind is blowing in the wrong direction, your exercise changes, even what I eat today seems to effect tomorrow’s bg, it’s almost impossible to get it right, then as a T2 you may well be producing insulin naturally that will work or not depending on god knows what.
I am lucky in a sense as I don’t produce any natural insulin so it’s more predictable.
This all becomes easier if you eat low carb, if the potatoe was 64 and you ratio is xx, imagine how much easier the steak is, you don’t need to know your ratio for the steak, ignore it! Isn’t that great (not strictly true but almost true as protein morphs 20% of itself into carbs but close enough for now).
I’m sorry if I misunderstood your question or made things more confusing, best of luck.