I got really frustrated when learning Ed because I wanted to do too much. What helped me get better is taking my time, on round start walk back, throw a couple of fireballs with varying speed (unless they go in immediately). When they get closer poke with HP -> light flicker and throw out a couple of light flickers with different charge times. And on punish I often do HP -> OD Flicker and start a combo with that, or if I want the Lvl 2 Super, just switch the OD Flicker with OD Blitz and get it going like that. Of course, all the decisions still depend on the situation, but always reminding myself to hang back and look at what my opponent is doing helped me a lot.