hey, i don't know about IM shooting, but i would veer away from it. i have very small, shitty, unvisible veins. you absolutely cannot see them. when i first started doing heroin quite a few junkies tried to hit them with no luck. i figured out that i can feel them though, and with the right angle and practice i can hit many veins now with no problems. i can also hit the veins in my hands, very carefully, though they are tiny. i don't know your veins, and i can't imagine them worse then mine, but i bet you could hit them. in my opinion, if you are gonna shoot up though... go for the mainline. good luck.