Well, let's see....
Trainer actually got Lucy all rigged up, so I can't really speak to that other than to recommend that you put the reins away very carefully so as not to get 'em all tangled.
Supposedly this is just like riding, but from the ground. Ha! You're trying to keep the excess rein from getting all tangled around your feet (hold it or throw it over a shoulder, but I kept dropping it) while you keep your outside rein loose, but not so loose it's dragging on the ground. The inside rein you use to keep your horse focused on you. When it's time to jog, you wiggle the outside rein and double-cluck (I ride Western), and with any luck your horse knows what's expected and starts to jog. Whoa still means whoa--pull back w/both reins, but it's harder to apply even pressure.
Getting your horse to turn is where it gets tricky. Relax the inside rein, pull (but not too hard) w/the outside rein, and if you're really lucky your horse turns!
Oh yeah, and at the end I walked behind her and reined a bit. This was to have her get accustomed to not being able to see whoever's at the other end of the reins. Lucy hasn't been worked a lot in the past couple years, so we're trying to bomb-proof her on the ground before getting her under saddle. In an abundance of caution. Naturally I'm chomping at the bit to ride her, but, being in my 50's, am letting common sense and respect for trainer override my impatience!
The above probably isn't a very good description, but it's what I remember. Trying to stay relaxed, watch the horse, the reins, and get yourself coordinated while trainer is calling out instructions is quite the challenge. (I hate that word; it actually was a pain in the butt, but a fun pain in the butt!)
Very hard work! Watching a trainer do it skillfully is a real treat. With any luck, I'll be able to do more of it at this week's lesson.
Mary