Google subcutaneous injections, read a couple of different articles, and then do a Google images for subcutaneous injection sites, make sure you're looking at the images for a man vs. woman, the sites are slightly different. From my personal experience, back of the arm hurts and is liable to stay sore (plus, tough to do by yourself). I've heard quad shots are the most painful (I can't pinch anything there at all so that's out of the question). For stomach shots, if you get a 1/2" long 28 g. needle it's not much of a big deal and you needn't worry, there's no way you can hit anything vital or any veins or arteries. You take a pinch of skin, stick the needle straight in at a 90 degree angle, inject. You don't aspirate with subcutaneous injections.
He's not up to 2x a day shots yet, he only started Sunday with 1/2 doses, but he already is noticing he generally "feels better." He's been on TRT for years now, I think it's going to be a really good combo. I'll start him on 2x a day full shots on Saturday, I want to make sure this stuff isn't knocking him out (I gave him a 1/2 morning dose last Sunday and he virtually slept all day, I want to make sure he's acclimated before I do that again and I don't want him falling asleep behind the wheel). You do need to sort of ramp it up and I think as the "researcher" is older you need to be even more careful. I once ran across a chart that showed how much your GH levels drop as you age and at 46 I literally have less than half of what I had at 20.
Now, the really INTERESTING part, apparently GH levels are directly linked to sex hormone levels. Combining the two is like a 1-2 punch.
I don't notice a lot of fat loss, but my husband says there's a difference. I do think I look better, it's real subtle though. My skin looks "fresher" hard to describe. I feel like I look better, if that makes sense.