I've had to replace a few of those in tank fuel pumps. Two GM vehicles (a k2500 truck and a GMC Jimmy) and one Ford Exploder.
I didn't find it to be that difficult of a job.. just jack up the back end, drop the tank, replace the fuel pump, and put the tank back up.
I didn't even empty the tank.. just used a hunk of board and a floor jack to lower and raise it.
Buying the pumps from the local auto parts store will cost you a bundle, tho.. if you can stand to leave the vehicle parked for a few days, you can get the pumps for half or even a third of the Auto Zone price off the internet.
What I dislike the most are those high pressure 'EZ' or 'Quick Connect' line connections. I had to buy a special tool to disconnect the lines, and it was anything but 'EZ' or 'quick'.
