For future reference, if youre gonna do something & someone else has done it, & you can tell youre gonna be spending a LOT more time at it that they did,, then its time to ask more questions,,
This PLug that youre working on is pulled out in order to torque head bolts, Its not a big deal, really, if youre 9 hours in & youre not done, STOP,, & ask questions before you get yourself so screwed up you have to haul it to a shop,

Rhinestone, Look in the tech section. If we are talking about the rubber plug under the head cap, I did mine with the engine in the frame. Two bolts MUST be installed in the head cap BEFORE putting it back. They are loose but not out as you lift off the head cap. There is a print out of the head cap bolt location which is very handy. Study up before you ruin your engine. We are talking about the head cap plug--right? hth
heroicseven has put up the link for the job in this thread.