So this is gonna be my first time replacing my spark plugs. I don't have one of those torque wrench things and it seems like you need to apply a certain amount of power to tighten the plug? i don't wanna screw anything up... what should i do in this case?

 

You do not need a torque wrench to install spark plugs. They do not need to be super tight. Just make sure to put alittle anti-seeze on the threads so they don't damage the aluminum head & you'll be fine. Just screw in the plugs until you feel them stop & them give them another 1/4turn with your ratchet.