Maggots are the best way I’ve found for trout, they will outfish worm because fish don’t bite off the ends of the worm and miss the hook. So, as above, a shortish spinning rod, a 4000 size fixed spool, I’d go with 8-10lb line as you will get snagged on rushes and ferns etc and it helps get more gear back. A couple of large ssg shot, or a small pinch of lead as a weight about 2ft above a hook (size 10 or so). You can then drop the rig into little pools, just at the edge of the main flow of rivers. Keep the line ‘tight’, just not loose coils billowing in the wind, don’t always strike at the first nibble…give them a chance to give a couple of tugs before you wind into them.
If the Tay is fly only I’d not bother…fly fishing is weird. And salmon rods aren’t expensive because they’re stronger…they’re expensive because of the pomp that surrounds salmon fishing.
Look for some little hill lochs and try fishing for brownies there. You can often find lochs that aren’t controlled, so free fishing, and nobody else about if you hike a distance to them.