I first learned about lucid dreams after reading a book my mom had bought, this was back when I was in grade 7 in 2001. I kept trying to lucid dreams without success, and I eventually gave up after several months. Then, in January of 2006, the interest in lucid dreams came BACK, but I gave up once again several weeks later.
Finally, in October of 2007, I got BACK INTO LUCID DREAMING FOR THE THIRD TIME... and I had my FIRST lucid dream on November 28th! It was really really awesome and I doubt I will give up so easily this time because I know it is actually possible for me to have them and I know how incredible it is.

I think the reason why the third attempt was successful was because I finally got in the habit of taking reality checks seriously and performing them regularily.