bicep for a while but im a little weary about it, i just kinda dont know where in the bicep to pin, upper,lower, or right down the middle? I'm not pinnin bi's because of that site injection crap, im sure that doesnt work,because if it did i would have huge a huge pair of shoulders and a huge ass, it just makes it more comfortable for me to hold the syringe and all. so any advice on that would be great thanks.