Hello
Honestly the best thing to do is use a strong satellite like nimiq 1 at 91.
You first configure elevation and declination.
You configure your receiver to use usals, you enter your longitude and longitude. Then the motor will go to where it is suppose to go to get 91. Even if you don't want scrambled channels, because you have an lnb that support it use those strong sats, it will be easier for the first time. If you want to verify reception, there are free channels on nimiq 91 (like channel 198, you will see when you scan that they don't have the dollar sign in front of them.
You have also a couple of 119. I think it is call dnfyi, again it won't have the dollar sign in front.
You then adjust the dish to have the best signal with nimiq 1.
Then you use 2 other strong sats (echostar 3 at 61.5) and (echostar 7 at 119).
They will allow you to adjust your arc. You play with the adjustment on the antenna if you are too high or too low.
Again you have to make sure that the post is exactly plumb.
Insure that the motor is. Sometimes I saw people with post perfectly plumb but the motor was not on the post. I will not work this way.
So after that you to from 61.5 to 119 and verify that you have great signal. You make adjustments.
Then after that you try with other sats linear ( I usually try t5 at 97, e9 at 121 and amc5 at 79.
One you did the fine tune with those sats you should be ok. You can even erase what you found on the strong sats if you want to have a clean installation, or do a factory reset.
Usals is very great to help you adjust motors, I always adjust them this way, I don't really work with my true south anymore, only to adjust in the beginning I place the dish and the motor at 0 degrees where I think my true south is approximatively.
Good luck
Best regards
Labgate