Take a look at the Teermanam adavu video to get a hang of it. I shall post the explanation with the photos later.
1. Be in Ardhamandala posture with hands held in Tripataka close to the chest.
2. Take the right leg forward and place in on the heels (The Natta position). Take your right hand forward in Tripataka hasta facing up. Keep it straight in line with the shoulders right in front of your eyes. The left hand is placed in Tripataka close to the chest. Say Dhit.
3. Now tap your left leg that is behind. Bring back your right hand in Tripataka close to the chest. Say Dhit.
4. Lastly tap your right leg. Move the right hand to the back and with Tripataka facing out. Say Tai.
Mirror the above instruction on the left hand side.