welcome to HM , the pins that you got will be good unless you got big gluts and have more fat there then normal, if thats the case then you should go with a 1.5" needle, you want to inject into the muscle not into fat, you could tell if you need a longer pin or not

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People say to me its possible to be too big.....but for me I dont want a physique thats average something thats reachable, I want something thats unobtainable that looks like its so hard to get, yes women hate it, BUT I FUCKIN LOVE IT....SO FUCK IT!! why do I want this??? CAUSE NORMAL FUCKIN SUCKS!!!