Saw the fret slots first, so that ensure accurate depth. Then do your dot inlays if you are going to, and then radius/polish.
Use a hand plane, a thickness sander, or a planer. Thats about the only way to get it right. Why dont you just buy a pre-slotted and radiused board from stewmac or lmii etc? Judging by your questions it seems that you are completely new to this and that would be a VERY wise decision. Cutting a fret board is difficult without the know how or the right tools man! You can pick up pre-slotted boards for 20-40 bucks usually.
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Ah, I've done plenty of refret, plus I have the tools already. Im just figuring out order and process. Besides, I won't learn if I dont do it Never did a "from scratch" build, and buying a premade fretboard isn't "from scratch" . I used cheap enough wood and parts. If I mess it up, its not the end of the world, I can start over and redo it. Probably should have started with a bolt on first, but oh well. Diving head first here haha.
I think Im gonna just make myself a routing jig for the body, wont hurt