I have looked at the Aling-A-Site, at about $150 give or take a few dollars Here is how it works
You use your software to find the dish pre-sets
You dial the settings into the Aling-a-site
You attach it to your dish, now you adjust so the arrows line up on the compass and the levels are all level, you are pre-set
Now you do your software driven "Fine tuning" which may be a bit trickey if you have not leveled the dish as a change in asmuty will change elevlation if not level.
Now here is how you do it using the traditional tools, I like my Wineguard like compass better than the one Ron gave me, but it's about 1/10the the cost of the Align-a-site.
Get the settings from the software (Same as A-A-S)
Level the tripod (Same as getting the levels right on the Aling-a-site but easier as you are only leveling the tripod)
Set the now level dish to the direction that makes the compass nedel line up right
Dial in the elevation and skew figures using markings on dish brackets
Fire up the software and fine tune.. .NOTE: A change in asmuth (angle you are pointing) will not affect elevation since the dish is now level
So, what is the advantage of the Aling-A-Site?
It has a sight tube, you can dial it up, take one step back from your dish and sight through the tube (with all the bubbles and needles lined up right) and see if there is a tree in the way.
Of course I can do that using nothing more than my Wineguard like (It's actually a hiker's compass I use) and a protractor from the dollar store