You will need a spark plug socket with 2 extensions.
Take your time in removing and replacing the plugs.
Once you have the socket locked into the plug, keep a firm grip and slowly turn to undo the plug.
It will eventually give.
Do one plug at a time.
Make sure your new plugs are gapped properly (platinum and iridium plugs are usually pre-gapped).
Again, use patience when installing the plugs.
Fasten firmly, but do not overtighten them.
You can break them if you overdo it.
Good luck and don't rush.
Take your time and you'll do just fine...
Hey, that rhymes....hehehehehehehe