The first lesson is the most important.
The teacher will convey the most important concepts and you had better pay attention, lest you miss all that heavenly glory.
Difficult, I know, when you are trying to work out which hand goes where.
For me, the most important concept was standing and letting the energy sink down the front of my body, into the ground, letting go.
You can also do this sitting down on a chair. Sit upright on a chair,perineum right on the edge, feet flat on the floor. Rest the hands palm down on the knees. Then let the energy sink down the front of the body, continuing between the legs, down into the ground.
Once you get the feeling for this try to carry it into your form.