Ok, adding my own experience to this one--when people said KLOW hurt, I thought they meant, like, AS you inject it. I was so pleased when I did it in my abdomen, same as my tirz, and felt almost nothing, just a super faint feeling of what might be discomfort and might be imagination. Went about my day. Woke up today, and the spot I'd injected was sore, and then this evening, felt a slight itch under the skin. I had pinned the second one on the other side, and deeper, and a little bit of pain there. No itch yet, but the itch took 24 hours to show up. No lump.
Went outside to take a short, fast walk because I've had no exercise today, and that walk turned into four miles (at a good clip, and up a very tall hill at the levee), and holy jeez I feel good. Both the pain and the itch went away as I was walking. The first site still has a red oval and some VERY faint discomfort, but no itch or pain. I had it in my head that maybe a brisk workout would get my blood flowing and make the site feel better, and it DOES feel better. I also felt really strong, like I could have walked for miles more. I know all that's almost certainly placebo, but I NEVER turn down placebo effect or try to question it out of helping me.
Also, I swear to God I feel SOMETHING under the skin of my face. My face and my lips under the skin both feel faintly tingly. I hope that's either the beginnings of something happening or placebo effect, cause the joke would be on me if that was an allergic reaction.