Adjust your feet to keep the stick straight in front of you. If it's not sitting level you have either too much or not enough rudder in. Imagine that your foot is attached to the thrust lever in the same side. If you increase thrust on the right side for example your right foot pushes in more rudder. Play with it in the sim when you're downwind. Move the thrust lever on your good engine up and down with the same foot to keep the stick straight. This will give you confidence in the technique. When you're landing either have your partner zero the rudder trim in the flair or use the opposite rudder to keep everything coordinated.