My 2007 Caliber 1.8L SXT is making a growling noise, coming primarily from the belt. I was told it was an idler pulley first, but now told it is more likely the alternator decoupler pulley. Is this possible to replace on my own? If so, what tools would I need? I’m handy with cars but not proficient, can usually figure it out with direction. All the shops in my city are 2-4 weeks out before taking new cars and I need to get to work. Any advice would be highly appreciated. Please help with any info you have. I am ready to tear it down and replace this, I have no other choice.