@Katie L  This is a great video.  Particularly the breaking into small chunks, and the over, and over, and over. . . .

I like that she explains that there is a different between playing and practice. 

Something she does not mention—breaking a day’s practice into smaller time increments (like 15 minutes).  I primarily practice in the evening, but sometimes I might just practice 15 minutes or so during the day (maybe multiple different times).  I will typically use this shorter time frame to work on something like a specific phrase (2-4 measures) that might be giving me trouble—something small to really focus on. 

It can also be easier to get started if you are not feeling particularly motivated that day (“Ugh, I really don’t want to practice—well, if I just work on that string crossing section for a few minutes, that’ll be okay.”).