You need to remove the 4 or 8 bolts that hold the track to the floor. Then you can remove the seat. But you must unclip the wires for the motor first before removing it so you do not damage them.
To replace the drivers side mirror on a 1966 Impala, remove the screws with a Philips head screwdriver. Remove the mirror , there will 2 5/16" bolts retaining the baseplate.
Get The Haynes manuel.
http://www.topix.com/forum/autos/chevrolet-impala/T4P2NGT979PJ7QT2P
Begin by removing the wiring harness from your 2005 Chevrolet Impala horn. Remove the horn retaining bolts. The horn will come off.
either smash it or take it to a body shop.
All of the air conditioner door are located in the evaporator case. They have electric motors that go bad. You may have to remove the glove box to gain access.
behind the fuses...remove the glove box
You will have to remove the gas tank and install a fuel module.
Your best bet is to get a Haynes Manual. They make one just for your car.
It is possible to get a disconnect switch from the dealer, but you have to show a need and pay for it.
You will have to remove the gas tank and install a fuel pump module.
You will have to remove the gas tank. Remove the retainer holding the assembly in and remove the unit. It is far less problems if you install the module assembly.