not that hard to do, you will need to check the way the old LNB is held on to the arm of the dish, if its a (sky dish) the LnB is pushed into the arm and held in by a plastic clip, just take the clip out and pull the old Lnb out of the arm, and slot the new one in" their the same size, just get the (right shape ) LNB so you can fit it back on or into the dish arm . do not move the dish even a little when your working on it, just get the right LNb shape that will fit your Dish arm , and you be fine .
w
October 2010