To relieve the tensioner, you have to get a wrench onto the tensioner arm and temporarily pull the arm away from the belt. The spring on the tensioner is a hoss. You'll need a cheater (extension) because you can't get enough leverage on a standard wrench or socket. There's almost no room to move the wrench handle. The whole job is a no-brainer. I spent more time digging for the wrench and cheater than I spent fiddling with the belt. Once you get the right wrench and cheater, it takes 5 minutes to swap belts.