Honestly, I think most are averse to needles, but you use an insulin pin for this injection (I believe), and it's about the most pain free experience you'll ever have.
Grab a little bit of your fat on your gut, pinch it, stick the pin in, and inject. You'll feel pain for maybe 1 second, and it's no more than a little pinch when the needle first goes in.
I cannot stress enough how easy and painless it is to do an insulin needle injection.