Once you get used to doing it, subcutaneous injections are no big deal. When I was taking Byetta, and later, Victoza, I injected myself, usually in the abdomen or thigh, with no trouble. The needles were small.
The problem started when I tried Bydureon, which is a once a week injection. The medication would raise up large knots under my skin that would take days to disappear. That's one of the reasons I stopped taking it.
Ordinarily, though, subcutaneous injections are done very quickly and easily, once the person gets the hang of the process.