You won't break the needle. In fact, after you inject try to twist the needle off in your hand. It's nearly impossible. I've had needles bend considerably trying to hit the glute; no breakage. I've had well over a thousand shots in my quads and really, I haven't noticed much scar tissue. How do you inject? I go in very slowly, and never jab or dart it in like the sites recommend. Maybe that's why I don't have a problem with scarring, I don't know, but my typical injection is 4-5cc, so conventional wisdom would say that my thighs should be like leather; they're not.