2003 Mazda MPV Needs tune up per local auto mechanic...

Vehicle has a mis fire and probably just needs new plugs and wires. I'd like to do the work myself but I've been told you have to take off part of the intake to get at a few of the plugs. Can you please direct me to where I can get a schematic or spec sheet w/ pictures so I can see a break down of exactly what needs to be done.

Thank you.......

MG