I'm too new to say much about working metal but when it comes to both shaping and finishing wood my absolute go-to tool is my card scraper (and burnisher, can't use it without). It leaves a fantastic finish, much better than sanding, doesn't choke on screwy grain. Most of all, I find it a much more intuitive way to free-shape wood when I've already removed the bulk with something else. Properly set with a good edge it can remove a lot more wood than you might think. It did take me a while to get rolling the edge right. Don't believe the videos saying you can just sharpen with w file and leave it. Do believe the ones that say "use about the pressure you'd use when buttering toast" to turn the edge with the burnisher. It's just a rectangle of thin spring steel, like you'd cut from a panel saw plate, but it works so well. for such a simple thing.
Oh... And cutting to fit instead of cutting to measurement
... marking knives/scribes instead of pencils.
I figured I'd add these since they're each things I've already used in my short knife making experience.