Volvo Repair: Volvo 850 fuel pump, fuel pressure regulator, 10mm nuts

Question
My 1993 850 GLT needs a fuel pump.  I'd like to do the job myself, but I don't know how to start.  It looks as though it might be accessible through the floor of the trunk.  Could you walk me through it, or suggest where I could read about it?  (The car was stalling while cruising. The fuel pressure regulator was just replaced, along with the flywheel sensor. The car still stalled, and they said the fuel pump also needs replacement.)
I have done some entailed repairs before and I will genuinely use the information you give me.

Answer
i WOULD TRY TO PURCHASE A REPAIR MANUAL EITHER HAYNES OR CHILTONS ESPECIALLY IF YOU DO LIKE TO DO ALOT OF THE REPAIRS YOURSELF.THE MANUAL WILL COME IN VERY HANDY TO HELP WITH THE REPAIRS.I DO NOT KNOW OF ANY ONLINE PLACES TO READ ON SUCH REPAIRS.

IT IS REALLY NOT HARD JUST REMOVE SPARE TIRE COVER,THEN REMOVE THE 10MM NUTS HOLDING THE COVERPLATE TO THE TRUNK FLOOR,THE PUMP IS UNDER THE LARGER OF THE 2 COVER PLATES THE OTHER IS THE FUEL GUAGE SENDING UNIT,THEN FOLLOW THE FUEL PUMP WIRE UP UNDER THE RIGHT SIDE TRUNK SIDE PANEL,DISCONNECT CONNECTOR THEN USE A SCREWDRIVER TO TURN THE FUEL PUMP UNIT NUT THEN THE PUMP WILL SIMPLY LIFT OUT.REINSTALL IN REVERSE ORDER.