Have you ever struggled to learn a piece of music on the kalimba, really studied in detail the exact notes you need to play? It seems that the kalimba is a simple instrument - there are only a few tines for your left thumb and a few tines for the right thumb. Surely this is simple. You should be able to master this instrument after a week of playing it, right?
But as soon as you approach a challenging song on the kalimba (and "challenging" is relative to where you are in your kalimba development), you may well feel that it's impossible. The notation system seems confusing. You are getting hopelessly lost on the instrument. Maybe you can connect three or four notes, but you cannot get any momentum, and you cannot get any flow. You cannot create music - certainly not the way you can when you just let your thumbs off the leash and start free playing.
Here is how mindfulness can help you.