The only problem I had with doing the trigger injection myself was that the glass vial didn't break cleanly - it smashed in my fingers, so then I had broken glass all over me, blood dripping on my hands, and then I was freaking out wondering if I was going to be injecting tiny particles of glass into my stomach. I think I probably squeezed the top of the vial a bit too hard, instead of just snapping it sideways IYKWIM.