If your hands shake sometimes for no reason, it could be a physical problem called "essential tremor" (the Germans, who are less polite, call it "senile tremor"). It usually starts when people are in their 50s or 60s. It's harmless but annoying. (Parkinson's disease, which causes similar tremors, is not harmless, so it's good to get it checked.) It can be controlled with beta blockers, for which
you need a prescription. I stumbled onto this by accident because I started taking a beta blocker for something else and was delighted to see the shaking much reduced. I had gotten to the point where I couldn't fly anything more interesting than a trainer without a transmitter tray to brace my right hand against. (The tray is a good idea in itself, too.) Beta blockers are sometimes prescribed for extreme cases of stage-fright, too.