"I just decided to cover my chest in a huge tattoo for fun"
That's scary as fuck xD
I assume you do it in front of a mirror? Still can't quite wrap my head around the angle. You must be covering most of the art (and/or the spot your targeting) while "drawing", sounds really difficult.
the first step is to draw it on your skin, then on the tracing paper. That way you know if you can do it, If you know how to do tats then you just need a mirror.