89 190E window motor replacement tips?

[RCH89190E]

After checking A to Z wiring and switches, have narrowed down a non-functioning front passenger window to a bad motor. Have replacement on the way and now about to task the removal of the old one. THE BIG QUESTION IS>>>>> Do I need to have the window in the lowered position for component removal and how do you manually lower an "up" power window? I will be replacing the whole unit, regulator and all, less the glass. This is for an 89 MB 190E
Thanks for any tips.