I have reached a huge stumblng block. I have been following Ander's rythm tutorial. He has a lesson where you mute several strums of a chord while you are playing the chord. Unless I lay my hand directly down on all the strings, the high strings especially don't mute. When I do this, I am not quick enough to get out of the mute postion straight away to the next chord. Any exercises or suggestions would be greatly appreciated.