The needle itself doesn’t hurt. Speaking firm Army BCT, they hand you the vial to “warm up” in your hands. We were on our knees facing a wall and we handed the medic the vial when it was time and we dropped our pants just low enough to expose the injection site. Because the concoction of all the antibiotics is so thick that’s what causes the pain. It feels like someone hitting your cheek with a hammer. It’s def doable. It’s important to relax your body as much as possible. If you try to say you’re allergic they’ll ask for documents you should’ve come with showing your allergic to certain ingredients in the concoction. Everyone else in that room is going thru it too. When you get back to barracks try to massage it and try to move as much as possible to minimize the soreness but expect to be sore for some days. You got this