Challenge to learn piano

I wake up to the fact that playing with both left and right hand is the most difficult part in playing the piano. 

201114 playing both hand will be easy if you go very slow. As you practice, it gets easier. The more I rush, the more I get struck. 

Learning piano is memory work and lots of repetition. Where is the winning factor?

260914 already learn left hand. Now how to combine both hand?