Dishpointer.com makes life easier! Found a brilliant site for aligning your dish correctly.
Simply insert your location e.g. street name, zip code, country
Choose satellite i.e. Thor 1 degree west
Zoom in until you find your house (if it will allow) and move the marker to exactly where your dish will be positioned. It will then draw a line from where you intend to place your dish to the satellite. Simply look at the line and use a building etc in view to align your dish. I am going to use a garage just over the road as the line runs directly through the middle of it.
One tip though: Sometimes it will say address unavailable (for whatever reason I do not know), if this happens just use your town/city name and then manually find your street etc.
You can also use it to align a multi LNB setup. Just enter satellites you require and it will do the rest!