Hi there, when taxiing if I'm not trying to make a tight turn I will only use brake to slow down before turning and then use rudder to make the turn (e.g when I am vacating a runway on to a taxiway or vice versa. If however I am wanting to make a tight, slow turn (into a parking bay or turning at end of runway) then I will use full rudder with ball of foot and brake as required to achieve speed and radius of turn.
You'll get use to it as you fly it more and you'll learn your own technique