Not to worry you further, but I would make it a personal goal to overcome that fear.  (If I am understanding what you said) Fear is a serious issue that is more of a risk than the date on the med.  I had it too at first.  I was terrified that I would not know when to give it.  When the first few times came I fought with myself to make the decision because doing it was scarry.  I was warned about hitting a vein and the whole thing seemed so overwhelming. 

I told about what happened with my year-old-son, in the previous post.  It happened because I interpreted his vomiting as an upset tummy or just a gagging dislike for lumpy oatmeal.   My interpretation was wrong and I think it was influenced by my fear.  After that time I gave him the inj. every time he vomited even if I was fairly sure it was not a virus.  Now it is routine for me.

Now that he is 17 the problem is different.  He is hesitant to give himself the injection.  As both of my CAH grew up when they got old enough to go to camps and off with freinds to the beach I would not allow them to go to certain camps or fun events at remote locations until they had successfully given themselves the injection at home.  I realized they might have that same reluctance I had had when they were babies.  I felt it was more important to help them overcome that fear before they left home than it was to teach them to drive or handle money.  My daughter was much easier to help past the fear.  Although he has given himself the injection now, he actually would choose to stay home from events than to give himself the injection to prove he could do it.   I finally had to get authoritarian with him and force the issue.  I still worry that he has not overcome the fear, I feel that when he leaves home his life will depend on his non-reluctance to stick a needle in his own body.