Food.
If it's any consolation, I too used to be afraid of pinning myself,..I mean, let's be honest, pushing a 1.5" piece of surgical steel into yourself isn't the most attractive thought,..but once you do it, you'll say to yourself,.."what the fuck was I so afraid of? Man! What a pussy I was!!!"
Seriously.
I had my wife depress the plunger for the first month or so of my first cycle,..now I look forward to it. For me, if I'm pinning my right glute I lean my left side up against the wall, so that I can see myself in the bathroom mirror, I put my right thumb on my hip, point my index finger straight down my leg, and spread my fingers out. My pinkie finger lands around the middle of my ass-cheek,..there's the spot! I look in the mirror, make sure that the pin is lined up straight(after using an alcohol swab of course), and press firmly,..once it breaks the skin it slides right to the end, perfect. Inject slowly and smoothly, pull it out smoothly and quickly, dab up any little droplets(or streams lol) of blood, massage the area, and !viola, feel like a god!!!!
Seriously, it's not as bad or as hard as you think it is.