I replaced mine @ 79K miles (for the first time) in about 30 min. There is a bolt which keeps the tensioner locked (M14 if I remember right). Open the bolt and remove it. Then using a 5 mm round bar place it into the tensioner opening and turn it right (while facing the engine). The belt will be untighted. Remove it. Put the new one in in the same sequence (start at the tensioning pulley first). lock the tensioner. You are preatty much done. Good luck.