Flyfishing for 75+ pound tarpon is the bowhunting of fishing. Sometimes you hunt for hours on end on the casting platform staring at the water and flats endlessly trying to see a string of fish or a laid up poon (much like spending hours behind the spotter, glass or on stand). When the fish materialize, you've got to make it happen. You've got to execute and put it all together - just like bowhunting big game - whether you're after a ram, elk, or in Africa. You've and put that fly within a 2-3' diameter spot, sometimes smaller, sometimes larger. You've got to constantly adjust your cast, strip speed, etc. to the conditions to feed the beast. When she eats, you've got to get that hook stuck in a mouth as hard as concrete. Strip strike - no trout sets here of you'll go home empty handed. You've got to clear the line and get tight on the reel without the line tangling on anything (your hand, reel, rod butt. Once on the reel, you've got to stop that freight train headed to the horizon and hope your hook set holds when she jumps for the heavens. Then settle in on your 11-13 wt. rod and fight down and dirty from the butt section of the rod to pour maximum pressure against the direction she is headed, up to your class tippet of mason hard - typically 16 lb. or 12 lb. test.
It is all about execution within a 3-10 second window. Make it happen or you're left to spin tales about how it should have been. Basically, the same as big-game bowhunting.