We have seen the Hand resurrect various people throughout the Netflix TV series, Harold Meechum, Nabu, Elektra and it is suggested (and seen) that various members of the hand leadership have also been resurrected. There are also conflicting ideas as to the bast way to kill a person that can be resurrected, at no point are the hand leadership concerned about decapitation for instance. Nobu was burnt and yet came back, while Harolds body was destroyed by fire to ensure he would never return.
It also appears that Resurrection affects people in different ways, with Harold becoming more psycotic but remembers his past lives easily, Elektra however is like a newborn child and given the hand leadership have no doubt been resurrected multiple times over the ages they seem a lot more mentally balanced then Harold was after just 1 resurrection. Nobu didn't seem to be more irrational when he returned.
So are there multiple methods the hands use for resurrecting someone, is one "safer" than another and do they require different ways to make sure a person can never be brought back?