Expiditon/F-150 Windshield Motor ???

Winshield wiper motor shot in 'OO Expidition. No doubt same as F-150. Any advise to ease the swap with new motor would be appreciated. Knee injured and I don't want to dig into anything without knowing at least something of where I'm going.
Looks to be behind shroud on firewall. Does the cowl cover that surrounds the wiper arms need to be removed as well?
Thanks,
Bridge