It shouldn't be very difficult to fix. It has happened a few times on our dish during heavy rain storms.
1. Find the signal settings on your DirecTV receiver, and open them. Turn up the volume loud enough to hear outside which will make a high pitched noise and adjust accordingly.
2. Have a friend or family member stand by a TV and use the and yell at you whenever you're adjusting the dish in different directions. My wife is pretty good at yelling at me so I use her whenever I adjust the dish.
