shoot it in your ass. Split an ass cheek into four boxes, and look to inject into the lower right box (on your right cheek) and the opposite for the left cheek. If the pin is 1.5 inches, bury it, but make sure your ass is not flexed..keep it relaxed. Aspirate the needle (actually pull the plunger out a bit, not push in....to see if there is any blood pulled into the needle, in which case pull it out). If not blood, you're good, push that plunger down until it's drained and you're good!