RE: splitting up Normas
As the guys have said, you aren't meant to break the silver stopper off. You peel off the thin silver protective top (at the very top), and push the needle through the rubber film to get to the oil inside.
If you somehow accidentally smash off the whole silver stopper, then just inject the whole vial in one go. It will make no difference to your cycle whether you inject half now and half in a few days, or all at once.