Obviously bleed and get straight on ice when you catch one.
Knock the fillets off ribs and all no need to scale, then cut the ribs away completely, like straight down pin bones and all, that part is just packed with bones, good berley though, or crab bait but not worth even trying to save to eat in fact it can mess with the next bit.
The fillet you have left will be almost diamond shaped, skin from the tail end, start it with the knife but once started you should be able to just pull the skin off, it will also pull away any pin bones you missed making a mess if you tried to get greed