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Ipod touch battery lost capacity over the years, decided it was time to attempt a replacement
I generally consider myself a good fixer. This repair is accurately described as "very difficult." It was really, really hard to separate the front panel glass from the case. I ripped the delicate cable as warned in step1. I didn't realize it was ripped until reassembly.
I had no problem with the soldering or any of the other steps.
Perhaps ifixit should sell dead devices that you could practice on before attempting the real repair.