Shooting delts by yourself is easy bro... It's hard getting away with a 25 gauge or smaller because you are using on hand and you want it to be easy to push the plunger.... Use a 23 gauge 1" and hold the pin with your thumb and middle finger and push the plunger with your index finger... Simple.... I find it easier them sticking an 1 1/2" in my ass... and I still can shoot a whole 3cc so what's the difference.... good luck