https://www.youtube.com/watch?v=SMtWHiPnISY I think this is pretty similar to the gen 2.5
the process is pretty simple but time consuming.
Undo air intake
undo a bunch of wiring harnesses
unbolt the top of the intake plenum
unbolt the bottom of the intake plenum
at this point, you will now have access to the valve covers and spark plugs. If you haven't done valve cover gaskets or spark plug shaft gaskets, now would be a good time to do those...
I also recommend picking up new air intake (plenum) gaskets. There are 2, one where the intake his the manifold that sits on top of the valley, and one that goes between the two pieces of the plenum.