A wrench will work just fine...if you want a 3/8 drive rachet fits in a square hole, on the Left side of the tensioner....push down to take the pressure off, slide the belt off....feed your new one all around, push down again on the tensioner, feed the belt under the idler....release your wrench...
watch out as that mofo has alot of tension...dont just release it quickly...you may eat the wrench...
Came out easy, was a bitch to get back on ..
(Was just me no one else)...
So I got smart and routed it and place the belt pass the idler pulley ? top middle pulley . Pull on the breaker bar was able to slip it on the pulley, then I got a better grip of the breaker bar and pull the belt back onto the ideler pulley..