What do i need to change spark plugs?

hi i have a 87 iroc-z camaro tht i actually just got back from the mechanic shop after 1500 dollars of fuel injection cleaning, gas tank flushing, new wires just about everything and the reason is because she was sittin in my oregon driveway with no cover for over 5yrs but when i got her running again i dont belive they changed the spark plugs on her and i was going do it myself but what do i need, would a haynes manual help?, what exact tools do i need, what are the best power effective spark plugs, where's the best place to get everything, how long should it take, is it hard, and should a 12 yr old with basicaly no tools and none mechanical experciance be able to do it? also the engine is a 305 tuned port injection ( fuel injection ) chevy thx!