Wait ,why wouldn't you ever NOT want to aspirate?? If your in deep enough your going to be in muscle whether you aspirate bubbles, or nothing at all. If your in a vein or worst yet an artery, you will get blood. I didnt check once in my delt, and administered the whole dose of gear into a vein! Though I was going to fucking die, worst feeling EVER!!!
Better safe then sorry. And some food for thought. For your glute, Extend your thum and pinky finger and measure with it from your hip down, and then your knee cap up, just to the side of the middle of your quad. Pick a small area and stick with it. I hope Thad made sense haha poke away ;D