replacing fuel filter
I have done this on another injecter type motor. There is alot you need to. The first is SOMEHOW drain the tank COMPLETELY. After that the filler tube and vent line need removed. Do not be surprised if the places on the clamps are HARD to get at.
After that you need have the tank somehow supported so when the bolts are removed holding the tank on. The tank does not hit your head. Then a screwdriver will work to loosen the ring holding the pump down.
You will also see an electrical connecter. Remember the position it is facing. It goes on one direction only. Providing you did all this. You then need remove the lines from the pump. When you did that, you then remove the pump. Also remember the direction the pump faced. If put in wrong, you will need to fill tank frequently.
Just think after that, you get to put the tank back on, reconnect the filler, and vent lines. Put the petrol back in that was removed, and hope no mistakes were made.
While this may not be exact. Hopefully a good idea of the work needed has been made. I am not fond of repairs done at dealers. This may be one time their cost may be worth it.