take the cam out fairly simple i didnt know the torque settings so tried them tight to set the torque wrench then they just lift out from under the cam drop new ones in and tighten cam back up.
not to sure about your pirate but mines a straight 4 i heard yours is similar but check it out.
i took the rocker cover off to see first and it look fairly simple. ( i have rebuilt other types of engine so i know a little but wouldnt have tried it if i was a nebie to machanics.
hope this helps