I couldn’t imagine trying to do my glute injections by myself. Just don’t think I’m that flexible and accurate.
I rotate 6 sites, going clockwise. Right delt, right glute, left glute, left delt, left quad, right quad.
I use 25g needles. 1” for glutes and quads, and 1/2” insulin syringes for delts. My wife does my injections for the most part, though I can do them on my quads. I could probably manage the delts myself too, but I won’t even try the glute on my own. Just let the wife do it and I know that I’ll never have to worry about misjudging the zone and having a stray sciatic collision.
If my wife wasn’t there to help me out I would probably just stick to quads. I can reach the delts, but I wouldn’t be able to aspirate, and that’s a deal breaker for me.