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plane
I've only got a couple of vintage apprentice made wooden ones we taped up and used as doorstops before children stopped us having nice things.
I think my dad has a couple though.
One of my wooden ones is long though maybe a ft or so. And I wondered if something like that would be easier to keep straight.
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Just try what you have to see what works best. I've been using planes for a long long time and done a lot of planing. Sometimes I'll plane a bit of wood for fun! You have to read the grain and judge how to set the plane and a lot of that is based on experience.
You could cut it with a hand saw and sand it with a block of wood wrapped in 80 grit sandpaper, finishing with 120/180 grit.
Yes, that’s a multi tool. Just a basic saw would do it though. Personally I would use one of my cheap single handed planes like the Stanley 102 block plane. Just to save damaging anything too expensive.