Changing Spark plugs in Mazda 3

Pull off engine cover. un-screw the 10 mm bolts holding down the plug wires \ pack and look into the hole and it should be right there.
 
My 06 2.3l was easy as pie. Make sure that the engine is cold before you do the plugs, and use anti-seize on the threads
 
Haven't studied the manual. But, what is the recommended mileage to change out the spark plugs? I certainly don't want to wait till I have a fouled plug and running like crap before doing this.
 
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