Wow thats one LONGGGG write-up just to replace a belt tensioner...
(condensed version)
-remove rear axel to give slack to belt.
-Take off Pulley cover
-Remove the 2 tensioner bolts
-Pull off tension
-Put guide on new tensioner
-Put on new one
-Tighten 2 bolts down with Lock-tight
-Pulley cover on
-Axel on.
However I give you a for detail (without torque specs) and great pictures.