420 Blower motor removal

[Bishop]

Hi Guys, how difficult is it to remove and install a new blower motor on my 89 420? It's started making squeeling noises, like bearings failing.

In my 91 Suburban or American vehicle, the blower motor is seen on the firewall and is easy to change, I don't see the blower motor on my 420.

I have the MB CD for the 420, but it's not as much help as I thought it would be.