If you don't know the sides of Tren, then you shouldn't use it. It's one of the heaviest steroids IMO when it comes to sides. Like Rick said, it's not the gear. You are just hitting a blood path when injecting. (Vein) I have bled once in the last 60 shots using glutes only. But I have my wife, who's a nurse do all my pins. She's very good. Just pin fast in top outer quadrant of glute, minimize the amount of veins you will travel by, by picking the best spot. Remember to aspirate. That can tell you alot about where that damn needle is. Goodluck bro.
P.S. Run the equipment at 600 for 14 to 16 weeks. Drop the primo and save it for a run later on.