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If we had met I am sure I could have taught you most of what you know in a morning. As to fish behavior, trout are no more easily spooked than any fish in shallow clear water if that is what you mean, it's just that trout are often in water like that that gives the impression they are more difficult than other fish. As to fooling them into taking your fly, that's just luck.
I only spoke as I found, I did not have much trouble or time learning to fly fish or how to be stealthy, spot places they may be if not actually see them, they are not difficult to work out, I expect you will call it water-craft like it is some mysterious art that only very intelligent people can learn and takes years.; I could sum it up on one page of a book. I caught a fish within an hour, quite a difficult cast actually. None of its rocket science, it doesn't take a A level, I started by looking at a couple of diagrams in a book that's all, once on the bank with a very old split cane fly rod (I had inherited it) I had it mastered in no time, fishing small streams was no more difficult, learned a bit of gentle roll casting and how to flick a fly to where I wanted, actually it was easier, no big long casts needed most of the time. I still fly fish now and then for mullet or coarse fish, catch a few small chub and perch here and there, nothing difficult never caught a mullet though.
Matching a fly to what the fish are taking, as long as you have good selection with you and your not blind, what's the big deal.
I am not saying it was all that easy but most of it was not difficult.
Any Neanderthal from a commercial could learn it in a day; probably less.