You've just got to work up the discipline and motivation, I don't know that anyone can help you with that. Make a list of dream goals, come up with your dream signs, but really you've got to have the passion to keep yourself RCing. Almost every lucid dream I've had has been from reality checking.

I suspect that you haven't quiet had that -AHA!- moment regarding reality checking, just like people who say that RCing is boring. Every single time you reality check, it should be because you just realized that everything around you might not be real. That you might ALREADY be in a dream. So technically, every reality check you do should be an incredibly thrilling moment because you just might be in a dream and about to become lucid.

Have you had a lucid dream before? It's hard to get into this mindframe at first, that nothing around you is real. It should get easier with experience, especially once you've had enough lucid dreams simply because you RC'ed.