You're good if you're hitting the right spot II. People hit ass cheeks for years and years and years without hitting a nerve. I personally cannot pin my own, so when I do hit them, my wife has to do it. It's actually a funny little dance, because she is scared to aspirate and see blood, so I have to aspirate, and then she will pin it home. I just can't stay twisted (read: contorted) for as long as it takes to pin 2+ml. I'm even starting to have issues hitting the ventroglute. Apparently I'm not so flexible when it comes to twisting.
POB: Quads are great if you ask me. Some people have problems and either knot up really bad or hit little (or big) nerves too often. But I have never had any problems with quads, knock on wood. For the ass end of my first cycle, I hit quads/delts/VGs exclusively. I've gone back now to hitting glutes and arms as well, but only because I've been pinning ED for 10 weeks, so I just wanted to spread the love.