I think of dream control as a part of my body. Like an arm that I've never moved before. You don't try to move your arm, you just move it. That helps with my dream control the most. As for more passive things, look in your pocket and pull out a pill for what you want. Can't fly? Pop a pill. Want to breathe fire? Pop a pill. Want to get high? Pop a pill. Pretty simple and effective.

*Note: This may or may not also work in real life, depending on what pill you take