Is contemplation of death auto-suggestion?

Is doing contemplation of death auto-suggestion to meditate ? is it working on my subconsciousness ? maybe i should just do auto suggestion telling my self many times to meditate - maybe its more effective ? can i do my own version of death contemplation or should i say exactly the words in the sutta ? if i can what are the guidelines that i should follow when make my own version ? If i dont fear death and dont care to die - is it still useful ? can i do death contemplation about people i care about ? you can only answer some questions i asked or add something i didnt ask about which is related and can be helpful