If ya used a decent kit and made it to the default mg/ml then it shouldnt hurt. You can inject tren anywhere and since you generally shoot it ED you do end up injecting everywhere.
I ALWAYS HIT THE DELTS AND QUADS...I ROTATE AROUND STARTING WITH MY RIGHT DELT...THEN LEFT DELT THEN...YOU GET IT......
THIS WAY THERE IS A 4 INJ. SPACE BETWEEN INJ. SPOTS.