Hmm, my doctor forgot to arrange injection training for me, just prescribed liquid E and syringes and left me on my own. My friend is dating a nurse, and set up a meeting between us where she trained me in self-injection technique. Now I'm good to go.
However, the nurse had me do it in my quad, I guess because it's within easy reach for me. Since that muscle has to contract a lot when climbing stairs, it hurt for a couple days afterward. I think I will inject myself there only if no one else is available when I need it. In general, my girlfriend is happy to inject me in the gluteus medius where I did not feel any pain.