[Richard]

Big job is a relative term.

Make a platform the same height as the basement floor. Remove the tape around the two ducts exiting the unit. Remove two hoses.
Turn off the power at the breakers and confirm no power with a voltmeter. Remove the power leads and ground. Disconnect the thermostat plug on top of the unit.

Remove the two screws, one at each outside corner, holding the unit to the basement floor. You may have additional shrouding between the unit and the door that needs to be removed.

The unit will now slide out onto the platform. I think it weighs somewhere between 150 and 200 lbs.

Take the sheet metal screws out that hold the top on. You now have access to the interior of the unit. To access the defective motor. You may have to remove more sheet metal panels.

I think I could have the motor out in two hours, BUT I have taken the units out several times.

Make sure you replace the motor capacitors while you have the unit out. They are behind the circuit board.