As Hydro mentioned, you can remove all the bed bolts, except the ones nearest the tailgate. Those need to be loosened a lot, but can be left "screwed in" slightly. Then you raise the bed up by the cab and support it on 4x4 blocks. Essentially the bed will be tilted enough to provide adequate work space. Having the cherry picker is certainly handy, but if you don't want to mess with it for whatever reason, then the bed tilt method (with a jack) is fairly easy.
It is my opinion that the pump is a fairly reliable component. That said, failure of the fuel pump at reasonably high mileage is certainly not uncommon. On another forum, TooManyToys has some data on failures (mileage at which some have had failures).
Low fuel pressure can readily ruin expensive injectors. So can air in the fuel. For that reason, it is HIGHLY recommended for every 6.0L owner to install a fuel pressure sensor and gauge. The earlier you see issues, the better chance you have at keeping the injectors. Absolute minimum fuel pressure (at any driving condition) is 45 psig. I use 50 psig as minimum.
I carry a spare fuel pump. Not so much because they fail so often, but because they might and I don't want an early $1500 injector job. You can save some money and buy only the pump. Ford does not sell the pump by itself, but you can buy it separately in the aftermarket. That said, if you have had poor quality fuel, it might just be best to buy the entire HFCM. Crud from bad fuel can plug up things inside the HFCM.
Fuel pump (made by Racor who is the company that supplied the OEM fuel pump):
[PFP58054]Racor 2003-07 Ford 6.0L Powerstroke diesel replacement fuel pump
HFCM pump and Manifold (cover) - part # 6C3Z-9G282-C
2003-2007 Ford part # 6C3Z-9G282-C - Fuel Pump
Sometimes the pump will pull air in at the water drain plug (it corrodes or the o-ring seal deteriorates). It is best to upgrade the water drain plug with the brass one below (Part # 6E7Z-9C082-A):
[6E7Z-9C082-A]Ford HFCM (Horizontal Fuel Conditioning Module) drain plug(2589259c91)
The drain plug o-ring (stock and also the updated plug) are most likely Buna N material. Viton holds up much better. The o-ring size is 111 if you want to upgrade to Viton.