I am easily distracted.
As such I have learned that if my art space/work space is messy, my mind is less apt to focus on the project in front of me. Struggling to find the right brush, forgetting to have made enough of the colour I need & panicking while my paint is drying or feeling constantly blinded by visual pollution even in my 30" square drafting area can be very detrimental to one's peace of mind and ultimately one's painting. This is often a result of a poorly organized space and cluttered work area. There is a very interesting post by Michael Hyatt in which he quotes Author & American professor Randy Pausch:
“ Clutter is death, it leads to thrashing...”
I've seen it happen in my classes. I've even seen people looking lost and fearful as they work, not having noticed that their reference image is sitting underneath their palette, that their hands are covered in paint or that the better part of the real-estate in their work area is being engulfed by, bags, containers, extra items that slow down their productivity and lead to spills and distraction. Their clutter is so high that they've not identified the source of their frustration. In my classes, I stress the importance of having as little as possible on your work area. Extra tubes of paint should be packed away. Only the essentials should be out. Everything else gets packed away.
I call it the "L" system. Creating a simple capital L shape around your drawing/painting board.
Here is a little diagram:
I hope this helps to clear your mind and lessen your frustration and bring more enjoyment and peace to your painting process!