The person using it (performing the injection) doesn't need any more training than an epipen, they are basically the same in that regard. You take off the cap,

The person using it (performing the injection) doesn't need any more training than an epipen, they are basically the same in that regard. You take off the cap, push it against the skin, and press a button. The slightly tricky part is loading the injector which would presumably be done by the patient well ahead of it actually being used.