STEP 1/7
If you buy flatfish at the fish market, they will give it to you if you ask for hair removal and intestines removal.
STEP 2/7
It makes a path towards the fin.
STEP 3/7
2. If you made a road with the content, put a knife in between and push it
STEP 4/7
It's going to be hard at first, but if you get the hang of it, you'll understand what it means to ride on a bone.
STEP 5/7
There's a rib in the head, so you can turn it off.
STEP 6/7
You have to do the same for the other side
STEP 7/7
I personally think that peeling off the skin is the most difficult thing... It will be helpful if you refer to the video.
It's hard to understand with pictures, but it'll be very helpful if you do it while watching videos.