is easier to align than a two-way satellite dish. The footprint from the TV broadcasting satellite coming down may be a thousand miles wide, so your aim can be a little off and you'll still get decent signal. But for two-way connections, if you are not spot-on with pointing back to the satellite, it will receive a much weaker signal FROM you, which can lead to one-way packet losses and higher retry rates that you might not notice. But they will degrade the system speed for everyone, yourself included.
There's some clever software
on the web that asks which satellite you need to line up, and then generates a calender for 6(?) months showing when that satellite will be directly between you and the sun, or moon, etc., so that for a few minutes you've got a chance to line it up directly--optically!
Other than that, azimuth and elevation, same as sextant
skills, are all that's really needed. Or best of all, something that will display your connection quality in db so that you can push for every last one. Pro installers usually have a "box" that sits outside with them and shows the numbers, a bit pricey for one-shot home use though. "Rocket Science versus The Cable Guy" ? [g]