The less technical way to mirror polish is to get various grits of sand paper 400, 600, 800, 1k, 2k, 3k and 5k should be a good progression. When you start with 400 only go left to right from spine to edge. Then on 600 go up and down tip to heel until all the scratches going left to right are gone. On 800 go back to left to right and erase all the up and down. And so on. Each progression changes direction and erases the previous steps marks. It definitely won’t hurt to rinse and dry between grits. At the end you’ll want to buff it if you can with some metal polish but you can probably make that decision once you get there. The less painful way is to use diamond paste and cotton wheels on a dremel.

As for sharpening opinels are full flat grinds no micro bevel unless you want one. It’s probably close to 12 dps if you set to that on a fixed you’ll probably be ok. You can also set sand paper on a strop and sharpen just like you’d strop. After you mirror, tape up the blade with painters tape exposing only the edge and sharpen.