Reality checks are really really easy to do, but they need to be taken seriously.
When I first started to do reality checks, I only did them whenever something scared me. Then I started doing them as much as possible. It's been a few months, and reality checks are a part of my every day routine now. lol. It sounds really silly, but I had my first lucid dream on November 28th. It was soo awesome and I owe it all to my reality checks (it was a reality check in the dream that made it lucid!).

When you do a reality check, don't just rush through it just to say you did one. Actually take time and think about it. If you don't take them seriously enough, you might actually end up doing a reality check in a dream, but still think it's real life!