Simpler way to separate the head from body from a skeletal mesh

Hey guys I guess this is the right place where to ask, so I’ll take it a step further: what if i wanted to replace the UE Mannequin’s head with a human head of my own making? I tried to scale the mannequin’s head to zero in Persona and then attach my other head as a socket, but when i get in the world and hit play the mannequin never changed (yes, i saved the files in persona)…