it’s easy be careful. Follow the rules on a video! Disconnect battery first and don’t over tighten belt make sure the source of the problem is fixed or you will blow the new alt. Mine is oil dripping into alt. It’s a known problem with Montero s . I had the leaks fixed once I’m not paying $1200 to do it again I have 300000 miles on my Monty I wish I could find another car under $2000 but NOT so I keep fixing the Monty GOOD LUCK!