Cast iron cooking is not hard...
In the early 70's I learned how to fry turkeys in a rendering kettle with an open fire underneath. We bought lard and cooked in down to an oil, then fried the turkeys. The only temperature control we had were the potatoes we cut up beforehand.
The next day we removed all of the lard save the last 1 to 2 inches of lard covering the inside of the kettle and turned it over until the next use.
When needed again it was turned back over and wiped out, re-heated and new lard was added. It may sound gross to some but the farmers that taught me thought this was the way to do it. Nobody was ever sickened by this in that last 40 years. We still do it.
Some may understand this and have enjoyed the crackling's from a real cook. Others may be put off by this but I will assure you that we had a special only for this use boat paddle used for stirring the pot.