My right hand for writing; my left hand for clicking
I'm practicing on touch typing (using both hands for typing without looking at the keyboard with all 10 fingers). In general, my right hand is stronger than my left hand. I decided to use my right hand for writing and keyboard practicing, and my left hand for clicking on the mouse. I click on the mouse with my left hand as well as with my right hand.
Clicking on the mouse by changing two hands rather than one is a good method to reduce the neck and shoulder pain. In many cases when I have neck or shoulder pain due to the right or the left hand clicking, I change the hand, and then the pain disappears.It's great.