Mostly it is paying attention to the wax, slowing down and trying to be calm instead of fast. Keep one hand on the client where you are going to apply the wax, the other hand is dipping into the wax. The dipping hand is the one you stare at, get enough product on your spatula for your area but not so much you can't control it. Because you have your other hand where you are going to apply, it will be very easy to know where you are now going with the spatula.
I hope that makes sense, this is one of those things (as silly as this may sound) that I learned I did after making my first Speed Wax DVD and got to watch. So...one hand on the forehead/brow, the other hand picking up some wax. Or one hand on the bikini, the other hand picking up the wax. Twist/turn the spatula so it doesn't drip. If it is soft wax, hold the spatula flat to the floor, if it is hard wax, slowly twirl the spatula to keep it in a ball.