The rear window install on my '51 was a huge project as well. I used a tool for the lock bead, but it was the one that was just stamped sheet metal and was hard on my hand. I wouldn't want to try it without the tool, but I'd get one with a better handle on it. The job kind of wore me out as well. I wouldn't have wanted to do it with the bed installed. Wit the cab sitting on the pallet, it was much easier to get at.
At least you got it done.
