The plenum definitely needs to come off. No question about it, there's just not enough room to lift the valve cover over the rockers with the upper plenum in the way.
Ya need special tools to unlock the high pressure fuel lines. Fear not, Autozone will loan them to you. And other than that, it's pretty much heads up. Like Jaber said, make sure you mark/remember where everything is hooked up, and you'll be fine.
Don't be scared, dive in there and have at it!
