Find polar axis in this .pdf drawing:
https://www.satelliteguys.us/xen/attachments/page06-pdf.54152/
The 51.8 degrees should be read on the polar mount mount axis, not the dish itself. Look at the line in the image and set your incinometer on that axis somehow on the part that does not move with the dish. That should read 51.8 degrees of elevation compared to the horizon. It should be close to this angle as possible, but you will likely end up moving it again to fine-tune once you get a signal.
Now adjust the declination (dish look angle in the diagram) to show your latitude- (38.2deg). If properly adjusted your dish should point 6.1 deg lower than your polar axis angle, and show 45.7 deg elevation on the back plate of your button-hook plate or rear dish surface. In that picture #1407, the increments are not in degrees of declination, but are indicating latitude, so when you have adjusted for your latitude at 38.2 you "should" get close to your 6.1 deg declination.
I really wish I were closer, 1000mi 1-way drive is just not in the cards right now. Maybe there is someone nearby that can help??
If your receiver is hooked up to a monitor near your dish, feedline running to your LNBF, and your receiver has a good transponder programmed in for your true-south satellite, VERY slowly move your dish east and west from center. You will get a good signal all the time, but no quality until you are pointed at a satellite with the indicated transponder. If Quality jumps up, you have found a signal. Good luck!!!
Credit:
PDF image link was taken from FaT Air's BUD installation manual at the top pf the C-band sub forum (sticky).
BUD manual