18g to pull and 25g to inject into the quad - takes just a few minutes, including time to warm the Test in hot/warm water to thin it out. I remember the first few times, and how careful I was; now it's just clean top, warm bottle, swap 18g in, pull medicine into syringe, swap 25g needle, clean skin, jab quickly, aspirate, inject, then press thumb for 10 or so seconds...
piece of cake!
I do quads because I find it a lot easier than reaching around for glutes, where I can do my right side no problem but left is an issue. I find aspirating hard with the glutes, but with the quads I can use both hands!