You could do all these steps and really mess up your nano. Instead of disassembling the iPod, carefully remove the remnants of the old glass which I assumed you have cracked. With the new glass in hand CAREFULLY sand one edge of the glass evenly. I used my fine grinder on my dremel tool. After assuring a snug fit I removed the adhesive and installed the glass. Looks great and functional and I didn't ruin my iPod in the process. And when I said sand one edge I mean one of the edges that has a "lip" on it. The other lip you can slide right in and push gently down for a nice fit. Do not remove the adhesive until you are sure of a good fit. This is a quick fix for those who are too queezy to take apart their device.
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