I had a 1TB Seagate drive that was getting increasingly slower and was making an intermittent grinding noise while my Mac was asleep.
The repair guide was spot on!!! Be sure to read all of the comments with the associated steps, as they can be very insightful! From start to finish the repair took less than a half hour.
Nothing new to add here, really. I would recommend wearing a headlight during repair!! An old man like me has trouble seeing in the dark! LOL