Deep Work, by Cal Newport. An excellent book on how to work on really big ideas/projects effectively, without losing your humanity in the process. This is a must-read for anyone serious about work.
Pomodoro Technique. This is well-documented with lots of apps and tools online, but it's pretty simple. Set a 25 minute timer. Work, without interruption, for 25 minutes. When the timer goes off, do not-work for 5 minutes - exercise, web surf, whatever. When that timer goes off, set another 25. It's nice because it does the boundary stuff this article talks about in a manageable way. It's not "I'm going to work hard all week", but rather "I'm going to work hard for 25 minutes".