£15 gets you a satellite detector so all you do is bolt the new dish to the wall, plug the detector in and wiggle the dish until it beeps. Running the cables to the receiver is the [potentially] big job.
If the plastic holding the lnb (bit that the cable fixes to on the dish) hasn’t perished then fit a dual lnb off ebay for a few quid and run the second cable. If you don’t move the dish you won’t need a sat beeper.
Edit: you won’t need a quad lnb unless you are recording stuff.