Easy but tailgate is HEAVY better with TWO PEOPLE with the person HOLDING the hatch/tailgate open  go to one end of the strut using abroad screwdriver lever off the clip if there is one then just lever the  strut off the ball joint do the same to other end of strut. Replace with new one line up the strut direction to match the other side to refit line hole up and tap on  till the ball holds same the other end replace clips if they were  fitted,  try action of hatch  does it hold open
                 wirecutterman
                
 January 2008