Zymrgy is giving good advice here.
Working manually with 1mm end-mills is hard. Far better to go very shallow with each pass, than to try and cut deep, which will just result in too much heat, swarf, and snapped bits.
It'll take you forever to cut it, and then think about how much harder copper is to work with, and then you'll know why most machinists I talked to winced when I mentioned cutting copper with 1mm end-mills. It can be done, but using very high RPM's, shallow passes and slow feed-rates, and it takes a long time.
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