Bro, unless you are extremely skinny with no meat on you, you should be using 1 1/2 inchers in the glutes! Save the inchers for quads and delts!
Injects are not totally pain free, they often hurt.Injects are often more painful the second day.Over time they get less and less painful. Unless you have some gear with extremely high BA.
Stand in the shower and let hot water hit it for awile. Or heating pad.