I usually fish either a pheasant tail nymph or zebra midge, no larger than a 16, underneath a green or grey scud, also no larger than 16, all below a strike indicator, presented with a drag free drift. Make a couple of mends in your line and then let the rig swing out when it reaches the end of the drift and always set the hook at the end of the drift. Please excuse my run-on of a sentence.