Time. The longer you have done shots, the less they will hurt. Good technique without moving the pin around helps. You can massage the area after the shot. Train the muscle that was injected and the oil will get moved around better. But really, time is your best friend. Yes, you can warm the oil up but be careful. Too hot and you get burnt. Its happened. Also, using gear that doesn’t hurt. Geneza is mostly been pain free for me. A lot of the high quality gear that N carries is going to be smooth with few issues unless you are not used to injects. In that case, anything is going to cause discomfort. Even pharm grade.