Child Safety Tattoos

Tattoos for all child at heart

I just bought a gun from this kid down the street who bought two and never uses this one. I sent off for grips needles and ink and just want to add some linework to my stuff. My only problem is that I recall watching the machine's assembly being kind of arcane and complex and can't remember how to do it properly. Please assist. Thank you.
Please don't lecture me and tell me I need to become an apprentice. I already have a perfectly functioning anus and do not need a new one. I don't want to be a tattoo artist. I have tattooed myself before with a real gun, not some scratch stick and, by the way, it came out great and my mom likes it. Also, I know about hygiene.
Most tattoo shops will autoclave needles, jewelry, etc. Or at least they do here.
Let me reiterate-- I'm adding to my own linework on my own body. I'm not inking swatikas on children.
I shoot film.