I know you are going to hate to hear this, but it really does depend on the person. Although, I do find it odd that you have inconsistent dream recall.

I can't say anything since I was a natural. All I CAN say though is be persistent. Persistence will eventually turn into success.

The ironic thing is that most people's success varies. Some people have their first LD in around 2-3 days, while others can take a few weeks or ever months.

Just try your hardest and learn the correct ways to do things, but don't try too hard. Stress is the enemy of a lucid dreamer.

Strike a balance.