When I first discovered lucid dreaming it took me a little over a month to get it right, and I only kept a dream journal for 4 entries and did reality checks all the time. I think I was trying too hard like you may be now, cause when I decided to take a break from dedicate LD practice, a few nights later I had my very first LD. Take a break, just keep LD in the back of your mind for a week and see what happens. Don't force the LD, let it happen ^^