Does the dash have to be in to install windshield

I do know that when one sets the dash on the side bolts it’s easy for ONE person to install the top bolts. I’m pretty sure you’ll need two people, one to hold dash while you’re up under a dash that’s a cramped-cluttered area putting the bolts in. Anytime you can copy how the assembly line did the job you’re on the east track.
No. I installed the dash in my old Dart by myself with the reversed hardware as the windshield was in and I wasn't going to remove it. We may have used two people when that dash went into my son's Dart as he was older by that time.