Belt Idler replacement

Anyone that can contribute with steps to replace any of the 3 idler wheels will be thank you, thank you, thank you'd. Diagrams or any experiences welcome. I assume the water tanks have to be taken out seeing there is only about 1.25 inches between the uni and the pulley?What size wrench is it? Which one of the three is the tensioner pulley? I will be in the garage trying to get my big paws in there. This is on the 2007 2.0 sxt.