Can I grind Tibetan Bodhi at home? I don't have professional tools such as vises, only sandpaper and two hands.

It is good to have sandpaper. Better get another caliper. Then prepare some coarse sandpaper to polish the chamfer, and fine sandpaper to remove the grinding marks. If you want to handle all kinds of documents conveniently, please have several. You can have another electric mill if you can. With the electric mill, you can simply put the whole vise on, and it is always no problem to hold it with your hands. You don't need these when you are on the road. You can do it in one step. . .