First, if you can finish the job in a weekend,
your're a better man than I for sure.

Remove/Take Apart/Dissassemble:

Discharge A/C (might want to go to local shop to recover
freon to be legal).

Drain radiator

Remove windshield wipers and cowl cover, and leaf filters.

Remove heater hoses at rear of block going into firewall.
Remove AC lines going to condenser unit - careful
new ones must be custom made.

Remove front seats.

Remove windshield sides, wood and dashtop.

Remove glove box, cig lighter, ash tray, radio.

Remove lower dash/AC unit

Remove drink tray/window switches and
shroud around heater vents (two sheet metal screws
on sides)

Remove heater levers - check your switch -
it's the upper left. Make sure the switch works
or wire a new toggle in somewhere.
Watch those wacky clips.

Remove the heater vent assy down below.
Lots of little clips - store in a good place.
Getting this part reminds me of a c-section birth.
At this point, celebrate your progress with a beverage.

Don't recall if you have to remove heater core all the way.

Now you can get to the fan/blower assy.
At least one bolt/screw you get to from cowl/up above.

It took me a couple months of weekends, but I
redid the dash wood and had the radiator repaired.

Best wishes,
you'll get your MB merit badge with this one....

PS - If after reading this you choose to sell your car
and buy one with a working heater blower motor,
none of us would blame you.....