I have a couple of ways to remember to be grateful. One thing I have is a grateful bench. It's a special bench that I sit on for a few minutes every time I walk my dog. I sit there specifically to think of things that I am grateful for since the last time I went there. And I can tell you sometimes it is so easy, but other times it is difficult, depending on the day or week I've had. But I am always able to stop and think about the things that I have or the good things that have happened--and when I'm done sitting there, I tend to feel happier than when I first sat down.
It also doesn't hurt to have something constantly reminding you to be grateful. I love this gratitude tee for that very reason. Not only does it have the words emblazoned on the front, but there is a tag on the lower right hem that also has a positive affirmation. It says, "Look, Be, Do Good!" I love it! And especially around this time of year, it's good to be reminded!