I don't really do anything "weird" when I stick myself. But I'm a firm believer of doing it only after a shower. I use 1 1/2" 22ga needles- alittle bigger than most use and it does have alittle bit of a sting to it- especially if the alcohol that I used to wipe the top of the vial off with and rubbed on my ass cheek isn't completely dry.
I do notice that I have tendencies to eat "not so" clean when I'm on. I don't know if its all in my head when I'm "on" or what, but I get these uncontrolable urges to eat alot more McDonalds double cheeseburgers. Then I'm mad as hell because I gave into the uge........I know, I know, I'm weak. But its just so damn good to me!!!