Easiest:

1.) Flying. I have great control over my flying. It works very consistently and although I have trouble going at high speeds, it's solid.

2.) Manifesting my Dream Guide. It seems my dream guide is always only a door, phone call or turn of the head away...

Hardest:

1.) Scene Changes. My god is dream spinning hard for me. I can never seem to go where I want to. I can never seem to change the scene to what I want to. It always seems to be random and out of control.

2.) Earthbending. In theory this always sounded easy to me. Just be as stubborn as a mountain and the earth will bend to your will. Well it doesn't. Only once was I ever able to Earthbend.