I would imagine that your insulin dose will be started at a minimal level to get you going and will be increased gradually, to allow you to adjust to it - and then, depending on what plan your medics have, they'll maybe take you off the meds and replace it with insulin long term.
Have you not discussed how to move forward on the insulin with the medic that prescribed it?
I started on a combination insulin in March, but started on a tiny dose, kept a good record of my BGs and discussed how to proceed with my DN every Friday morning. We tweaked the doses most weeks and I gradually stopped the meds, so the transition was a very gentle one. The insulin you're on (I think) is a basal background once a day insulin, which will just top up what your body produces, so isn't likely to cause hypos in itself as it's slow acting.
The secret is to do things gently and to bring your BGs down steadily, as a fast decline in your numbers can cause problems in itself. You really need to discuss a regime working forwards with your DN or whoever manages you routinely.