Having read all the comments, I was prepared for a tough job replacing the battery of my iPod classic 160GB 6th gen. But I was very positively surprised. Using an iSesamo tool and a number of plastic pieces that I cut from a small pizza salad container, it was done in less than 20 mins. I used the iSesamo tool to carefully pry open the case, and the plastic pieces to make the clips stay open while I continued to the next clip with the tool. Only slipped once with the tool, making a small scratch in the metal case. No bloodshed, no sweat, no tears. And the case still looks great, aside from the small scratch, no dents or bendings. My iPod now works great again. Thank you iFixit and all the comments here, it helped a lot.