Fixin to install a new door on my cab. Has a steel bar (L shaped) that attaches to the cab frame via the hinges and then 3 or 4 mounting points for the glass.
Concern is that I just paid $640 for this sucker and don't want to shatter it into a million pieces while trying to install it.

Take the frame off the cab and put the two on a flat table?

Get a helper and have them hold it (vertically) while I attach and tighten the nuts?

How tight it tight?