The way your hand moves whilst writing

The pattern of strokes needed to form a letter are stored in the brain as a motor plan.

The motor plans (also referred to as representations)  for letters contain information about the  relative length, direction and sequence of the strokes needed to form each letter. 

Well learned motor plans control the direction and sequence of the strokes without the need for feedback for completing the movements with reasonable accuracy.    

The movements (strokes) used to form letters are pre-planned and very rapid. In fact the speed of fluent handwriting is so fast that they are completed before any sensory information from the muscles or from vision reaches the brain.  

People who inevitably have trouble with handwriting and calligraphy write with their fingers. They "draw" the letters. A finger-writer puts the full weight of his/her hand on the paper, his fingers form the letters, and he picks his hand up repeatedly to move it across the paper as he writes.

People for whom writing comes more easily may rest their hands fairly heavily on the paper, but their forearms and shoulders move as they write. Their writing has a cadence that shows they're using at least some of the right muscle groups. They don't draw the letters with their fingers; the fingers serve more as guides.

your fingers should hold the pen in place and act as a guide, and all the movement should come from the shoulder girdle. This is one of the main muscle groups you use to raise your arm and rotate it in a big circle, like Popeye powering up for a thunder punch.