I just bought a 2007 2.4 automatic and had an overall inspection. The car has 58k miles on it. The mechanic quoted me what I think is a pretty outrageous amount of cash to change the spark plugs. Ive changed my own spark plugs in my previous cars. Can anyone tell me what would be special or difficult about changing them out in our cars? Other than a torque wrench do I need some special tools? Things to look out for?