Fix your satellite dish to something solid - pointing south
Run the cable from the dish to your decoder
Tune your TV to your decoder
Tune channel 1 on your decoder to 11.139GHz Horizontal
Get your friend to move the dish very slowly to the west
Shout stop when the picture is good.
Fix dish in place
If this sounds too much like hard work or too complex, give your local TV guy
a phone and get him to do this stage for you - it shouldn't cost too much.