Jangling the nerves=causing nervous frustration, anxiety, etc. This is explained more fully in the article you were reading:
Tinkling the ivories, jangling the nerves – from Weekend Guardian (edited)
The most popular instrument for beginners is the piano though I don’t know why this is so; it’s expensive, a b****r to play and weighs a ton. Being difficult to play (10 notes at once!) the piano could make you vulnerable to a syndrome known as Lipchitz’s Dilemma. Lipchitz was an Austrian behavioural psychologist who observed that setting out to acquire a difficult skill leads to one of just two alternative results. Either, because of lack of talent or lack of application, you reach only a low to average level of attainment, which leads to general dissatisfaction and maudlin sessions of wandering about the house, kicking the furniture, muttering ‘I’m hopeless at everything’. Or you reach a very high attainment level but, because you spend 18 hours a day practising, other aspects of your personality do not develop properly which leads to general dissatisfaction and maudlin sessions of wandering around the house, kicking the furniture, muttering ‘Up the Villa’. Having established that no good at all can come of any sort of endeavour, Lipchitz gave up behavioural psychology and took a job in a post office.
I hope this is helpful,