I started practicing with one of these. Find some really old steak knives or chef knives. I had some steak knives that couldn't cut anything but butter, and if I threw them away I'd be happy to just be rid of trash. Knives you really don't care about.

Anyway, watch some videos and get to work on them with the 400 grit. You'll have to remove a lot of steel, but that's fine. You don't care about the knives so it's fine if you ruin them, which you probably won't. At some point you'll get a new edge on it and can move to the 1000 grit side to finish it off.

It's actually pretty easy and it doesn't take long to get the feel for holding an angle.

https://www.amazon.com/Whetstone-Cutlery-Two-Sided-Stone/dp/B0055B2RGO

I've had this one for ages, and it's pretty solid.

Is this one , but I think any 400/1000 would work, all you need is good technique