Compass skills are nice....but I like to cheat whenever I can and save time.
...5 hours later!!! Compass skills baby!
I bought this awhile back, some others probably have one, but this is called a SatelLOCK. I picked it up at Skywalker for under $20.
It is a tool that has a Plum/Bob level built into the cap. It is hollowed out so you place it onto the dish mount shaft, from there Plum and level the mount, then remove the cap, underneath is a compass. There is an azimuth scale on the side. Turn the indicator until it aligns with the correct azimuth setting. Then rotate the tool until the compass aligns with that setting. There is a slot on the front and back of the tool. Use a permanent marker in these slots to mark the lines on the mount shaft. These lines are exactly where the dish will be pointing. I just put the clamp on the line in the rear, and it points correctly everytime.
This thing is cheap, and it has saved me hours.... Others opinions may differ.