Like DC410, I just tie a simple spinner pattern but Tricos are one of the few flies where I'll do a few variations and I employ a few tricks because the fish get fussier the more times I fish the hatch at the same place.
I tie generic spinners that I call Tricos with black thread abdomens. I also tie the abdomen with white and very pale light olive thread (BCS 020) to imitate female Tricos. On all three versions I use 2 white or 2 light dun Microfibbets split widely for the tail even though the natural has 3.
I use Black Superfine dubbing but prefer Peacock Black Ice Dub for the thorax. The trick to Ice Dub is to use VERY little and dub with a VERY tacky wax like Overton's or BT's Super Tacky.
The spent wing is where I get fancy...
First I like it very sparse but I use three different materials. First I tie in 2 or 3 and only 2 or 3 strands of pearl Crystal Flash. After that it is a barely a wisp of white or pale dun EP Fibers or HiViz.
After that is tied in, I add a single strand of black Crystal Flash at the front of the wing and pull it forward to simulate the light black leading edge on the wing on the natural. Then I trim the completed wing on each side of the fly to the length I feel is correct.
I USED to tie wings made of nothing but pearl Crystal Flash, about 6 or so strands. They worked great and had the sparse look I like but they diidn't float as well as a combination wing.
Other tricks I do for fussy fish is tie two Tricos on the same shank facing each other a larger hook like a size 20 to imitate two flies together. I also thread one or two regular Tricos on my tippet followed by knotting one to the end of my tippet to simulate a cluster.
In addition, I tie a few sinking spinners with black & white abdomens made of Ultra Wire and I tie a generic female dun imitation as thorax pattern with a brown body and dun tails, wing & hackle. A really small BWO works just fine too.
As far as technique goes, I always fish 7X or 8X and make constant very small adjustments to my presentation to change the drift if I get refusals from steady risers.
One other thing, don't go home when the spinner fall ends, tie on a beetle...
I can't tell you how many fish and how much fun I've had fishing the water with a beetle after a Trico spinner fall. My only reasoning is, like eating hors d'oeuvres at a fancy dinner party, I imagine the trout are a bit frustrated after sipping tiny flies all morning so they are still hungry and looking up. 😉