Take a large task and break it down into smaller tasks will increase your chances of getting it done. This has been a recurring theme in my life lately. A great example of this happened yesterday at the gym. I am wicked out of shape and if I were told to do 50 ring dips, 100 push ups, and 150 squats it would never get done. Yet it did because I was told to do 10 rounds of 5 ring dips, 10 push ups, and 15 squats. I try to apply this to all aspects of my life. I always have multiple paintings going at a time and I will flit between them during my work time. I do this so I can get more done, while the paint is drying on one I am working on the next and so on. I find this increases my enjoyment in painting as well. When I come back to a painting I get to see it with fresh eyes and often think of new possibilities while I am away from it.
I would love to hear how you break things down in the comments.