The plugs are a bear to get to, but it can be done w/o removing the intake or throttle body if you have a couple of extensions and swivels for your ratchet.
Remember to use Anit-Sieze on the plug threads - steel plugs and aluminum heads can become very attached to each other and the threads usually pull out of the heads when that happens.
Also use Dielectric grease in the inside of the plug wire boots. Just a little will do, but it seals the connection and makes the wires easier to remove at the next plug change.
Just my .02
