Well you could use the little tv thing, but you have to bring an extension cord, remote controls and your receiver out there too. Then you have to hook it all up outdoors. With radio wireless headphones, both hands are free for adjustment and you go for the highest and fastest beep on the Ultra. I have done it a number of times in the past. Believe me when I say that it is way easier to hook the receiver up where it goes indoors and then adjust based on beeps in a headphone. Way safer too if your dish is on your roof, or at some height.
Math and angles are fine, but nothing compares to adjusting based upon the actual satellite position in the sky. I am glad you did a site survey with your compass.
If the dish comes from your local area somewhere, and the last owner got the arc, then leave the declination adjustment alone. Only adjust for a position around your pole, and for elevation. Don't forget to first get your zenith position on your dish. That's where the dish is exactly straight up and not leaning even slightly either east or west. Then you can use your compass to roughly aim it. Don't forget that you aren't dealing with magnetic north, but true north. Check for magnetic deviation for your area.
Set on a hot transponder and loosen all bolts on your dish except for declination. Then basically dance with it - all around, up and down, until you get your beeps.
I guess I worry about that because when I first got a Ku setup five years ago, it took me months to get anything. Now I can aim it darn close within ten minutes using the headphone method. Good luck,stay safe, whichever way you go.