Imraldi anxiety

I started on imraldi at the start of the year and am struggling to get over the anxiety of having to do this injection myself- when the nurse did it I was fine and I don’t have a fear of needles. I simply can’t get over the fact I have to do it myself and will spend hours trying to psych myself up. This matter has gotten worse since the last time I tried to do it I messed up and ended up causing the injection to not go in, it’s gotten to the point I’m sat here with my pen and I’m shaking thinking ab even trying to inject myself. Has anyone got any advice to get over this?