So you cant get the nozzle into the fuel fill hole?
where are you located? I ask because in australia they put a restrictor in to stop ppl using leaded fuel in unleaded vehicles, and what you've described sound like it.
Go the whole hog and remove the aircon radiator and all the connection pipes as well, put them on scale and tell us, I'd guess 15-20 kilos, they all should just unbolt, the one uder the dash I'd leave unless you've got a spare 4hrs.
Be aware that LED's dont shine like normal globes they have/are a more direct kind of light, have you seen them being used in a dash?
Neon dash lihgts might look good too.
http://www.skylinesaustralia.com/forums/in...6entry2051746
Edit
This is what I meant sorry
http://www.skylinesaustralia.com/forums/in...&gopid=2155539&
Personally I wouldn't change the glass myself, there is a tecnique to working with the rubbers that I cant master but the doors are easy enough, any windscreen place could do it, get them to change one pane and give you a run down on it.