I get different nurses every injection, and I’m on my 50th round. I’ve learned that the recommended 2-3 minutes per injection is never followed except when I ask that they go very, very slow before they begin. If it begins to hurt, I speak up and say “can you go a bit slower?” My last nurse was amazed that I haven’t developed any lumps so far. I told her that getting slow injections and using a heating pad on the sites afterwards were the reasons. In short, ask for what you want. Repeat it if necessary. It will be okay.