MAJOR P.I .T.A !!!!   IF YOU HAVE ACCESS TO A LIFT AND A FRIEND IT
IS  DOABLE . THE PROBLEM IS WHAT YOU WILL FIND!  RUSTED TANK?$$$$
OR  GASKETS /SEALS/LINES/  ALL OF THE ABOVE OR JUST SOME. THE FIRST THING IS TO SEE IF YOU CAN LOCALIZE THE AREA.BENTLY HAS A GOOD EXPLODED DIAGRAM.  HAD TO REPAIR MY TANK IN MY 86GL AND FOUND THAT THE TRICK IS TWO  OR THREE PEOPLE AND A LIFT. THEN A WEEK TO GET
ALL OF THE SEALS AND GASKETS. (CART BEFORE THE HORSE...)