If you expect to ride your wave of motivation, you are doomed to fail. Motivated is a transient feeling that changes more quickly than your clothes. Motivated goes away when you’ve had a busy day, you’re hungry, you’re tired, the kids expect to be fed (the nerve!), and then you get down on yourself for not following through on your goal. Establishing a habit is like going on a diet. If you think of it as going on a diet, the frustration of deprivation gets to you, but when you think of it as a lifestyle change, a never-going-back-I’m-moving-forward change, you don’t look forward to not being on the diet any more. You can’t look at keeping a journal as this spiffy new project that’s going to be lots of fun and uplifting and enlightening and … whatever you think journaling is about. Think of it like brushing your teeth. It’s a necessary habit, nothing more, nothing less.
There are lots of articles out there about building good habits—let me boil down every last single one of them for you: Just do it.