Sure, you can plane by hand, but it's easier and faster with an electric planer. You will need access to an electrical outlet, but mains-powered tools have a very stable power subbly.
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Makita 2012NB/2 Portable Planer Thicknesser 240V
HSS Toolshop
Makita 2012NB 304mm Thicknesser (110V & 240V) - 240V