I think people who don't need to inject don't realize how benign it really is: I'm not diabetic, but I did need to give myself 3/daily subcut injections (same style as insulin) for a month after an injury. It was absolute agony for the first week or so; often I'd need to psyche myself up for a good 15 minutes before injecting. But by the end of the process it was a 15 second endeavor that I didn't mind in the slightest.