spark plug replacement on 2003 Toyota Sequoia

how do you change spark plugs on 4.7 toyota sequia engine were are they located

Asked by for the 2003 Toyota Sequoia
i would let a repair shop doing the replacement if you can't locate a spark plug.
1 more answer
This, what seems to be a simple procedure, is not. Let a PAT(PROFESSIONAL AUTO TECH) do the job.