Just did it!
Thank you for your DIY. It took me only 20 minutes to replace the tensioner, the idler pulley and the serpentine belt. I took a 16 inches ratchet with a T60 to unload the tensioner in front of the car and it wasn't hard at all with that. I know, I'm very strong for my 160lbs... The idler pulley have a 16mm bolt and the tensioner's bolt took me a E14 torx box.