@ancestor it'll help if you can give us the exact model of your iPod. Yes to the way you want to use the opening tool. Sometimes you may have to help it with a small jewelers screwdriver, or as in the case of the Classic, a thin putty knife. Yes, it is a bear to open ...:-)
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=== Update (02/23/2017) ===
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Yes that is a 4th gen iPod Photo. A bit of a bear to open due to a very solid back cover. Check this guide to see see the clips and how to use the tool. I also use the smallest jewelers screwdiver I have to assist in prying it carefully apart.
@ancestor it'll help if you can give us the exact model of your iPod. Yes to the way you want to use the opening tool. Sometimes you may have to help it with a small jewelers screwdriver, or as in the case of the Classic, a thin putty knife. Yes, it is a bear to open ...:-)