First time injection here. I have some 1" needles and very very low body fat. I know most of you guys go for the 1 1/2 incher, but is the 1 inch for the butt unheard of? I think I can make it into the muscle, but am nervous because I heard bad things can happen if it is not deep enough. Also, I read about asperation... this basically is done to see if you hit a vessel? You just draw back a bit? Is a good outcome when there is no blood? Thanks all for the help.