The blower works fine but I'm getting any air thru the defroster vents. on 1995 Oldsmobile Cutlass Ciera

I get air thru all other vents except the defroster vents.

It sounds like the defroster door is not working, most likely it is a defective defroster door actuator.

here are some shops:
Is this repair something that can be done at home? Or is it possible to get the defroster open and just keep it open?