>>869187It is easiest to just find out trying. I like cutting on my hip and upper arm. Haven't tried stomach or chest (yet) because it seems scary (I'm really thin, so barely any flesh there).
Legs are inconvenient because I'm hairy :/
Safest place is probably your (lower) arms and legs. Cuts on your arm are harder to hide though.
Do superficial cuts if you are afraid, they still hurt enough.