[durf]

Yah, very easy. I swapped pumps in my '94 in the parking lot in front of my girlfriend's apartment in about half an hour. I used a big channel-lock wrench to undo the sealing ring. Other than that, a Torx screwdriver to take off the hatch floor and maybe a flathead to pry out the checkvalves are the only tools you need.

Speaking of check valves, be careful with them. I managed to put a tiny crack in one and had gas spraying around for about two weeks before I noticed. I was able to get replacements off a parts car, but they are VERY VERY VERY hard to push back in to the nylon fuel lines.

 

[durf]

No, the tank doesn't have to come down. The hatch floor comes out (held in by a pair of Torx screws), then there's a silver-color cover over the pump that is held in by a pair of hex retainers. The pump fits into a hole in the top of the tank.

Looking at my shop manual, it's a different procedure for the LH-Jetronic models, but you still get at it from the trunk. You don't have to worry about those nasty plastic check valves. If you like, I can PM the removal and refitting instructions to you or something.