There is already lots of good advice here. I just want to point out
that glider school schedules tend to be rather vague and fluid. You're
not going to the doctor's office to be "seen" so that you can quickly
leave. Make it a habit to arrive early so that you can watch others and
learn. Don't allow yourself to become upset if your lesson doesn't
happen precisely when it is scheduled. Talk to people, make friends,
learn from them! Once you learn the ropes and can safely do so, make
yourself useful.

Soaring is more than just a sterile skill to be mastered, it is a
culture and a worldwide community. So take the time to relax, to
listen, and to allow yourself to be steeped in it.

Vaughn