I’m an ex IV drug user. It’s been years so I may not remember the order. But when you inject (at least in the arm) you feel it in your stomach, then throat, then brain. You’ll get a lil queasy feeling, then you’ll taste something in the back of your mouth. Sometimes it’s the drug, sometimes it’s just metallic or weird. But you notice it. And then the hit… Hits. It’s fucking fascinating. Injecting molly is like boarding a rocket ship, and those little feelings gave you a rhythm. Push > stomach - hand the needle off (for safety, you don’t have time to cap and store that thing) > throat - lay down > head - congrats you’re rolling face in 10 seconds flat and in about a minute or two you can probably open your eyes without throwing up.