Yeah, I had an issue with doing the stabbing motion. My muscles often would just give out and not complete the motion with enough force. And that was after struggling to do it at all for several minutes each time. For me it's probably partly that I'm on the Autism spectrum and have ADHD as well. But I just recently got this same autoinjector. Way too expensive for what it is, and the high US tariffs for importing it make it even worse. But as long as it lasts a while, it was well worth it.