Defroster vent replacement - How hard???

It might have to be. My passenger side vent was faded and I had the glovebox, radio and HVAC controls already out of the way so I removed the vent and spray painted it the correct color. My drivers side vent was in great shape but I thought about removing it until I noticed how difficult it was going to be to get the nuts off on the far side so left it. I was worried that getting the nut off would be a lot easier compared to getting it back on.

Post pics of your car! I'm in the process of reassembling my 75 Scamp and just installed new trunk weather stripping this morning... easy job compared to some of the other ones like putting the windows back in.