Start With Three

Do not install all of GTD in one weekend. Start with one capture tool, the 2-minute rule, and a short weekly review; let the full system grow from those habits.

Most people who quit GTD do the same thing: they try to build the flawless system before they've captured a single task. Perfectionism is the real enemy here. Start messy, refine a little each week, and within a month you'll have a setup shaped to how you actually work and think.