I've tried to quantify what i would tell the bairn in an effort to word what i was refferring to before.
Observation being the key, it is learning which twitch of the line to respond too, and how.
Tightenening the line instead of striking with the rod will allow you to continue your retrieve if you miss or if it was a false alarm. Lightweight flylines help, the reduced drag of a 3 or 4 wt line on the surface allows the lines to present less resistance to the fish and be moved more easily, indicating a take more readily. This helps with spotting more takes in the first place.
For a start small indicators help if you install them on the leader and not the flyline, small dryflies or foam pads help you spot the movements that covert to fish. Once you become accustomed to the indication you can remove the indicator and use the flyline as your source for movement.Greasing the first foot or so of leader at the end of the flyline can also be used (the great Frank Sawyer did this).
Figure of eight retrieves help you to stay in contact with the flies and this helps to convert hook ups.
Sinking lines are different, normally it is done by feel, but again the striking thing with nips and plucks, a tightening of the line will be more useful and allow missed takes to perhaps become additional follows as the fly has kept in a fairly constant motion.
Varying the speed of retrieve will allow you to try different depths, once you find the fish you will catch, the time spent experimenting at the start of the day will pay off later on.
The other thing to remember is stillwater fish move around so watching a feeding fish you can establish a pattern and then intercept it. casting at a riseform is pointless as the fish is already gone, casting ahead or behind the sworl gives a 50\50 chance of hitting the fish's path. The type of sworl indicates how fast the fish is travelling and how deep it is swimming, time spent watching fish in clear water will help you learn these things. then you can predict roughly where the fish is going to be when you cast.
The advantage on stillwater is a duff cast is soon forgotten as the fish has moved anyway, much less likely to spook than on the river, where the fish hold station to feed and are easily spooked by inaccurate casting.
hope this helps, i dont think i've ever typed so fast
Sandy