I've been on 5-shot-a-day insulin in the past. I'm also a recent nursing school graduate. I used this tip on many patients and they all LOVED me.
Now, this will only work if you have stretch marks. So any ladies without them... sorry! Us ladies with them finally get a benefit from them.
My stretch marks are wide and kind of resemble tire treads! lol
So... here you go. Pinch the belly (this is for insulin and Lovenox people) and inject directly into the stretch mark. There are no nerve endings there. You won't feel a single thing. Fortunately, for me... I have plenty (thanks genetics!) and I can rotate my injections and still be fine.
Also, don't rub the sites after the injections. (Especially Lovenox) I notice some people mentioning bruising and knots. This will exacerbate that. Oh, and always press plunger slowly. If not, you're shocking the tissue around it. Then it bruises or swells to heal itself.
Let me know if it helps you. The bigger the stretch mark, the better the results because the skin is completely pulled, in my case, so you can shoot it right in! Tiny stretch marks probably won't be that helpful.
Anyway... there you go. Hope it helps!