98 S-10 pickup valve cover

How tough is it to change a valve cover gasket on a 4 cyl? Everything on top has to come off?

http://www.autozone.com/autozone/repairinfo/repairguide/repairGuideContent.jsp?chapterTitle=Engine+Mechani cal&partName=Engine+And+Engine+Rebuilding&pageId=0900c152802500d0&subChapterTitle=Rocker+Arm++Valve++Cover&partId=0900c1528024ffff