I am in a similar position. The advice given in the thread sounds good. I am almost up to the five power chords but I am also trying to learn Happy Birthday. I suppose it is easy for some. I am struggling to get from G to D to G and really hard time going from G to C to G. I know it is a matter of repitition. The calluses are starting to form but my fingers still hurt. I have a month to do this it is only three chrods so I hope there is time to master it. I had not thought of the metronome. I have to give that a try. Good luck in your A minor to E.