If using Usals, which most people use, you set the dish, motor, and LNB to zero, then use your receiver, once you've input your Latitude, and Logitude, to drive the dish to a suitable satellite, like Thor 0.8W.
You then physically move, and adjust your dish to peak the signal, on 0.8W.
Uou then tighten everything up and, using your receiver, send it East, 28.2E, 39E, or even 42E, and make a note of your signal quality readings, you then send it to 30W, and not those signal quality readings.
You then send it back to 0.8W, make any minor adjustments, then send it again East, then West, and see what your signal quality readings are.
You keep doing this until you're satisfied.
The most important thing, when setting up a motorized system, is to ensure your pole is plumb, and strong enough to handle the weight of the motor, and dish, even in strong winds.