it's your first time pinning into your quad, so it will feel sore the first few times. Try pinning in other areas to see if your other muscles can tolerate it first time around (delts, glutes, traps). If you stick to your quads, the soreness will not be there after it's been stabbed a few times. You could always try massaging the area after you've pinned, maybe heat up the gear before hand? My first quad injection hurt for about a week, couldn't walk, just sitting down was a workout.