When I got back into fly fishing about 10 years ago- with little prior experience, and a gap of about 30 years- it took me a year to catch my first trout. A 14" brown from pocket water on Penn's Creek, on a drowned #16 elk hair caddis. We were both very surprised.
It's gotten a lot easier. I'm still probably below average, compared to the regulars here. But I've learned that it's doable.
This time of year, I'd put on a weighted black sculpin and tie a #22 zebra midge larva or jujube nymph on 6" of 6X tippet tied from the hook bend of the big fly. Toss it into the head of a run at a slight angle upstream and swing it downstream about 25-30 ft., retrieve with a hand-twist, looping the line around your hand, and repeat. The size/weight of the sculpin depends on how much weight you need to get it to tumble across the bottom without sinking like a rock and hanging up. It's a balance. But if you can get a fly to tumble across the bottom naturally, you'll eventually get a fish.
Keep control of your line. Both in the water and in your hand. "Loosely tight" in the water- not taut like retrieving a spinner, but try to keep a belly out of the line. When it comes time to retrieve, strip it over the index finger of your rod hand, and pick up line and loop it in coils with the other hand. Just use the same amount of line, and a flip or roll cast of about 20', paying out another 10' of slack on the downstream drift.
Pay attention. They hit and quit quick. If you feel one on, don't jerk like a madman, just lift the rod (I still have trouble with that.)
Remember to lay low and try to stay out of sight. Fish from just a little outside of the edge of the water where the fish are.
Learn to tie and tighten your knots right. Practically the first time out, I lost a really nice fish on the take, because of a bad knot.
If you don't have a teacher, you can still learn a lot from Youtube videos. Especially the basic basics. But I have to admit, after that, you'll learn more, faster, if you have a guide. I'm stubborn, and cheap, and I enjoy the challenge of figuring out new water. But I have to admit, the success rate improves considerably when fishing with a competent local.