Weight on left foot...facing diagonal wall. Simplified...man's part...

Natural Turn:(1) right foot forward then (2) side with left foot then (3) close right to left. Think of this as simply 1/2 a box step beginning on the right foot. You should end up backing LOD. Count is SQQ.
Back Lock (For simplicity take the next 3 steps backing LOD): (1) Step back on the left foot (2) Step back on right foot (3) Cross left on front of right for the lock. Count is SQQ.

Now usually you take the next right foot back for count S...but this depends on what you are doing next. It helps to do a shoulder lead on the second step of the lock.

Lady's Part:

NAtural Turn: (1) BAck left (2) side right (3) CLose left to right. You should start backing DW and end up facing LOD. Count SQQ.

Lock Step: (1) Forward right foot down LOD (2) Forward left foot (3) Cross right behind left. Count SQQ.

I'll leave the rest up to your teacher.