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I found it far easier to remove the right button by squeezing the part where the hinge is (near the back) with tweezers, which unpegs the hinge. Then you just lift the hinge part out the back, slide the button forward slightly, and then remove it
I used this guide to replace the batteries on a 2GB and a 4GB Nano. This is a great guide with good attention to the important details. These are also much easier to take apart than 4th generation Nanos from my experience.
I used this to help tear down my Wii clean out a wad of dust and pet hair. Thanks for the guide!